VSS on Spark: ERROR Error in configuring context manager handler: 'functions'

arnaud.langer2 · October 25, 2025, 3:50pm

At the very end of the deployment of the VSS blueprint on DGX Spark, I have the following error while context is being set. Any call to VSS engine results in a similar error.

via-server-1         | 2025-10-24 20:49:23,466 INFO Initializing Context Manager Handler no.: 0
via-server-1         | 2025-10-24 20:49:23,467 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:23,468 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:23,468 INFO Initializing Context Manager Process no.: 1
via-server-1         | 2025-10-24 20:49:23,470 INFO Initializing Context Manager Process no.: 2
via-server-1         | 2025-10-24 20:49:23,471 INFO Initializing Context Manager Process no.: 3
via-server-1         | 2025-10-24 20:49:23,472 INFO Initializing Context Manager Process no.: 4
via-server-1         | 2025-10-24 20:49:23,472 INFO Initializing Context Manager Process no.: 5
via-server-1         | 2025-10-24 20:49:23,473 INFO Initializing Context Manager Process no.: 6
via-server-1         | 2025-10-24 20:49:23,474 INFO Initializing Context Manager Process no.: 7
via-server-1         | 2025-10-24 20:49:23,475 INFO Initializing Context Manager Process no.: 8
via-server-1         | 2025-10-24 20:49:23,476 INFO Initializing Context Manager Process no.: 9
via-server-1         | 2025-10-24 20:49:23,477 INFO Initialized VIA Stream Handler
via-server-1         | INFO:     Started server process [220]
via-server-1         | INFO:     Waiting for application startup.
via-server-1         | INFO:     Application startup complete.
via-server-1         | INFO:     Uvicorn running on http://0.0.0.0:8100 (Press CTRL+C to quit)
via-server-1         | 2025-10-24 20:49:23,466 INFO Initializing Context Manager Handler no.: 0
via-server-1         | 2025-10-24 20:49:23,467 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:23,468 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:23,468 INFO Initializing Context Manager Process no.: 1
via-server-1         | 2025-10-24 20:49:23,470 INFO Initializing Context Manager Process no.: 2
via-server-1         | 2025-10-24 20:49:23,471 INFO Initializing Context Manager Process no.: 3
via-server-1         | 2025-10-24 20:49:23,472 INFO Initializing Context Manager Process no.: 4
via-server-1         | 2025-10-24 20:49:23,472 INFO Initializing Context Manager Process no.: 5
via-server-1         | 2025-10-24 20:49:23,473 INFO Initializing Context Manager Process no.: 6
via-server-1         | 2025-10-24 20:49:23,474 INFO Initializing Context Manager Process no.: 7
via-server-1         | 2025-10-24 20:49:23,475 INFO Initializing Context Manager Process no.: 8
via-server-1         | 2025-10-24 20:49:23,476 INFO Initializing Context Manager Process no.: 9
via-server-1         | 2025-10-24 20:49:23,477 INFO Initialized VIA Stream Handler
via-server-1         | INFO:     Started server process [220]
via-server-1         | INFO:     Waiting for application startup.
via-server-1         | INFO:     Application startup complete.
via-server-1         | INFO:     Uvicorn running on http://0.0.0.0:8100 (Press CTRL+C to quit)
via-server-1         | INFO:     127.0.0.1:47424 - "GET /health/ready HTTP/1.1" 200 OK
via-server-1         | INFO:     127.0.0.1:47424 - "GET /health/ready HTTP/1.1" 200 OK


via-server-1         | 2025-10-24 20:49:25 | ERROR | gradio_web_server | Error loading default prompts: 'functions'
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr | Traceback (most recent call last):
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |   File "/opt/nvidia/via/via-engine/via_demo_client.py", line 204, in <module>
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |     demo = build_demo(args)
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |            ^^^^^^^^^^^^^^^^
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |   File "/opt/nvidia/via/via-engine/via_demo_client.py", line 159, in build_demo
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |     build_summarization(args, appConfig, logger)
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |   File "/opt/nvidia/via/via-engine/client/summarization.py", line 883, in build_summarization
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |     (
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr | ValueError: too many values to unpack (expected 3)
via-server-1         | 2025-10-24 20:49:25 | ERROR | gradio_web_server | Error loading default prompts: 'functions'
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr | Traceback (most recent call last):
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |   File "/opt/nvidia/via/via-engine/via_demo_client.py", line 204, in <module>
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |     demo = build_demo(args)
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |            ^^^^^^^^^^^^^^^^
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |   File "/opt/nvidia/via/via-engine/via_demo_client.py", line 159, in build_demo
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |     build_summarization(args, appConfig, logger)
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |   File "/opt/nvidia/via/via-engine/client/summarization.py", line 883, in build_summarization
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr |     (
via-server-1         | 2025-10-24 20:49:25 | ERROR | stderr | ValueError: too many values to unpack (expected 3)

via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 6
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 7
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 5
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 2
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 8
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 3
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 4
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 9
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 1
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure


via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 6
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 7
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 5
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 2
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 8
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 3
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 4
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 9
via-server-1         | 2025-10-24 20:49:28,015 INFO Initializing Context Manager Handler no.: 1
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Error in configuring context manager handler: 'functions'
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         | 
via-server-1         | 2025-10-24 20:49:28,016 ERROR Traceback (most recent call last):
via-server-1         |   File "/usr/local/lib/python3.12/dist-packages/vss_ctx_rag/context_manager/context_manager_handler.py", line 99, in aconfigure
via-server-1         |     for function_name in config["functions"]:
via-server-1         |                          ~~~~~~^^^^^^^^^^^^^
via-server-1         | KeyError: 'functions'
via-server-1         |

aniculescu · October 28, 2025, 4:26pm

Are you using the VSS event reviewer local deployment or the Standard VSS (Hybrid Deployment)

arnaud.langer2 · October 30, 2025, 9:57pm

Yes, more specifically I’m following: Local Deployment Single GPU: Deploy Using Docker Compose ARM — Video Search and Summarization Agent

aniculescu · October 31, 2025, 3:10pm

Please reference our playbook for how to use VSS specifically on Spark: Try NVIDIA NIM APIs

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VSS on Spark: ERROR Error in configuring context manager handler: 'functions'

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