Hello @vishal Prabhu , Thanks for using Microsoft Q&A Platform.
As per the error message looks like there are too few categories in your dataset. The limit is set to 2, but your dataset has 0 categories. Try to check your dataset and make sure that it has at least 2 categories.
Make sure to check the COCO file once again whether the required fields are correct: https://video2.skills-academy.com/en-us/azure/ai-services/computer-vision/how-to/model-customization?tabs=rest#about-coco-files
I hope this helps.
Regards,
Vasavi.