No element "nvstreammux" while trying gstreamer exmaple command from official Nvidia documentation

Hey,
We are trying to execute the example commands from Gst-nvdspreprocess (Alpha) — DeepStream 6.1.1 Release documentation using
gst-launch-1.0 filesrc location = /opt/nvidia/deepstream/deepstream/samples/streams/sample_1080p_h264.mp4 ! qtdemux ! \ h264parse ! nvv4l2decoder ! m.sink_0 nvstreammux name=m batch-size=1 width=1920 height=1080 ! nvvideoconvert ! \ nvdspreprocess config-file= /opt/nvidia/deepstream/deepstream/sources/gst-plugins/gst-nvdspreprocess/config_preprocess.txt ! \ nvinfer config-file-path= /opt/nvidia/deepstream/deepstream/samples/configs/deepstream-app/config_infer_primary.txt \ input-tensor-meta=1 batch-size=7 ! nvmultistreamtiler width=1920 height=1080 ! nvvideoconvert ! nvdsosd ! nveglglessink

But i am getting Error as mentioned below looks like nvstreamux plugin is affecting my pipeline but this is an example command straight from official page i am also confused if my installation is broken or this commands is old

WARNING: erroneous pipeline: no element "nvstreammux

Any kind of help and suggestion would be appreciated

Environment

deepstream-app version 6.0.1, 
DeepStreamSDK 6.0.1, 
CUDA Driver Version: 11.6, 
CUDA Runtime Version: 11.4, 
TensorRT Version: 8.4, 
cuDNN Version: 8.4, 
libNVWarp360 Version: 2.0.1d3

GPU Type: NVIDIA RTX A6000
Nvidia Driver Version: 510.60.02
Operating System : Ubuntu 21:
Python Version : 3.7

Link followed

https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_plugin_gst-nvdspreprocess.html

Command used :

h264parse ! nvv4l2decoder ! m.sink_0 nvstreammux name=m batch-size=1 width=1920 height=1080 ! nvvideoconvert ! \
nvdspreprocess config-file= /opt/nvidia/deepstream/deepstream/sources/gst-plugins/gst-nvdspreprocess/config_preprocess.txt  ! \
nvinfer config-file-path= /opt/nvidia/deepstream/deepstream/samples/configs/deepstream-app/config_infer_primary.txt \
input-tensor-meta=1 batch-size=7  ! nvmultistreamtiler width=1920 height=1080 ! nvvideoconvert ! nvdsosd ! nveglglessink```

There is no update from you for a period, assuming this is not an issue anymore.
Hence we are closing this topic. If need further support, please open a new one.
Thanks

DeepStream 6.0.1 is based on CUDA 11.4 and TensorRT 7.1
Your DeepStream is not installed correctly.

Please install latest DeepStream SDK according to the guidance. Quickstart Guide — DeepStream 6.1.1 Release documentation

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