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TFS Error after upgrade

Last Modified: 2020-02-28
We upgraded from TFS2012 Update4 to TFS2018 Update3.
Whole upgrade process completed successfully. Now when we are connecting to server or doing Checkout/Checkin/ViewPendingChanges then it is throwing error:
TF400898: An internal error occurred. Activity id: a3c9069e-26c5-4b9a-abbb-eb1f88da2e91.

We can do all activities like Checkout/Checkin/ViewPendingChanges but after doing these we are getting this above mentioned error too along with Action completed message.
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