Jetson Nano: AttributeError: 'NoneType' object has no attribute 'create_execution_context

[lesreaper]

System

Library	Version
Jetson Nano on Jetpack	4.5.1
CUDA	10.2
TensorRT	7.1.3
PyTorch	1.8
TorchVision	0.9.0
Tensorflow	2.4.0

Verified USB Webcam is working with OpenCV and Tensorflow TRT Yolo model in same virtual environment.

Installed system requirements, installed trt_pose repo, downloaded model assets to the /models directory, and getting this error when running:
python iva.py 0

optimized model path: /home/nvidia/ActionAI/models/resnet18_baseline_att_224x224_A_epoch_249_trt.pth
[TensorRT] ERROR: coreReadArchive.cpp (31) - Serialization Error in verifyHeader: 0 (Magic tag does not match)
[TensorRT] ERROR: INVALID_STATE: std::exception
[TensorRT] ERROR: INVALID_CONFIG: Deserialize the cuda engine failed.
Traceback (most recent call last):
  File "iva.py", line 42, in <module>
    model_trt.load_state_dict(torch.load(OPTIMIZED_MODEL))
  File "/home/nvidia/.virtualenvs/py3tf23cv4/lib/python3.6/site-packages/torch/nn/modules/module.py", line 1209, in load_state_dict
    load(self)
  File "/home/nvidia/.virtualenvs/py3tf23cv4/lib/python3.6/site-packages/torch/nn/modules/module.py", line 1204, in load
    state_dict, prefix, local_metadata, True, missing_keys, unexpected_keys, error_msgs)
  File "/home/nvidia/.virtualenvs/py3tf23cv4/lib/python3.6/site-packages/torch2trt-0.2.0-py3.6-linux-aarch64.egg/torch2trt/torch2trt.py", line 454, in _load_from_state_dict
    self.context = self.engine.create_execution_context()
AttributeError: 'NoneType' object has no attribute 'create_execution_context'

There is an article on nVIdia which says this could be to mismatching input sizes, though I don't see how that could be. The other thing is it could be a TensorRT incompatibility.

Has anyone been able to get this running on a Jetson Nano with the Jetpack 4.5? Any ideas out there?

[alice929]

Have you solved the above problem？