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SK-TDA4VM: Gstreamer error

Part Number: SK-TDA4VM


Now, I'm performing demo by following below url.
Part 6: Putting it all together: end-to-end AI application development

Then, I observed following error when I run python script(
(python3:1453): GStreamer-CRITICAL **: 05:15:25.144: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed

(Note : I understood that model path information on above url is old, so I changed setting portion of my_configuration.yaml which set model path as shown below.
model_path: /opt/model_zoo/TFL-CL-0000-mobileNetV1-mlperf
topN: 5   )

Do you have any clue to solve this issue ?