A Microsoft file hosting and synchronization service.
Hi there Jayashri T,
Welcome to Microsoft Community
I'm Bobadoye and I'd be happy to help you out with your question.
Apparently, this error indicates the particular SharePoint Folder or library is already under the OneDrive sync (or under any other folder already in sync)! So, to avoid double sync, the Microsoft OneDrive client displays this error message popup.
To resolve the issue, Login to the OneDrive web and delete the Shortcut. Alternatively, you can Click on App launcher in the upper-left corner >> OneDrive >> My Files >> Delete the “chained” folder shortcut.
You can also leave the shortcut in OneDrive and access the Files from your OneDrive folder in File Explorer instead of establishing a new sync.
This error may happen when there is some sync operation in progress as part of existing sync addition/removal. If the above solution doesn’t work, try unlinking your account from OneDrive (Right click on your OneDrive icon> setting>Account Tab> Unlink this PC), restart your PC, and then link it to a new folder to re-establish the sync.
Click on the link below to find other solutions if these previous steps do not work:
https://support.microsoft.com/article/aaa2d172-8d45-4e94-9c04-5364d04ca2f4
I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further.
Best Regards,
Bobadoye