Hi @Simon_Wolf
Welcome to the Hailo community. The reason you are seeing this error is due to the fact that your model was compiled to use in-built NMS of Hailo. In PySDK, we support our own postprocessor and Hailo NMS as well. But the JSON needs to be configured accordingly. The instructions to do this are covered in User Guide 2: Running Your First Object Detection Model on a Hailo Device Using DeGirum PySDK. Briefly, you need to use a different postprocessing module. Please try this and let us know if you still see issues.