ERROR in app: Exception on /models/images/generic/image-object-detection [POST]

Hi!,
I am trying to create a DetectNet with DIGITS following the jetson-inference tutorial(https://github.com/dusty-nv/jetson-inference/blob/master/docs/detectnet-training.md#creating-detectnet-model-with-digits)
I am training in a DGX with CUDA 10.0 so I am using version 19.02-caffe.
When I try to train I get the following error: ERROR in app: Exception on / models / images / generic / image-object-detection [POST]
Any ideas?