"We couldn't sync this library" error when you use the OneDrive sync client

Important:  Groove OneDrive error icon
Support for the old OneDrive sync app (groove.exe) with SharePoint Online will end on January 11, 2021.
Learn more about what you need to do.

Note: This article applies only to the previous OneDrive for work or schoolsync app (groove.exe). In most cases, we recommend that you use the newer OneDrive sync app (onedrive.exe) instead. Which OneDrive app?


When you use the Microsoft OneDrive for work or school (formerly Microsoft SkyDrive Pro) sync client to synchronize files between Microsoft SharePoint and Windows Explorer, you receive the following error message:

We couldn’t sync this library.

When you click Technical Details in the error window, you receive the following message:

The query cannot be completed because the number of lookup columns it contains exceeds the lookup column threshold enforced by the administrator.

Error code=0x80070093; Error source=Groove


To resolve this issue, reduce the number of lookup columns in the affected SharePoint list, and then try to synchronize the library. Do this until the error is no longer triggered. To delete a column, follow these steps:

  1. Browse to the affected SharePoint list.

  2. Click the LIBRARY tab on the SharePoint ribbon, and then click Library Settings.

  3. In the list of columns, click the name of the column that you want to delete.

  4. Click Delete at the bottom of the Edit Column page, and then click OK.

NOTE: Before you delete a column, consider how this might affect the list.

More information

For more information about columns in SharePoint, see the following Microsoft websites:

Still need help? Go to Microsoft Community.

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