@Megha Jadhav - Thanks for the question and using MS Q&A platform.
If any of our pipelines referring to datasets or linked services or other pipelines which are not existing in our pipeline, then in that case you usually end up with this error message.
Could you please cross verify all your pipelines and see if they are referring to any of non existing datasets or linked services or triggers or pipelines ?
For more details, refer to the similar threads addressing the same issue:
https://www.huuhka.net/troubleshooting-azure-data-factory-v2-publish/
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