OAuth Error: We can't authorize you because of an OAuth error. For more information, contact your salesforce administrator

 OAuth Error: We can't authorize you because of an OAuth error. For more information, contact your salesforce administrator

Reason:

There is an idle time for every session that you are logged in,e.g.,  if the system stays idle for more than 10 min or based upon session time expiry it throws an OAuth Error. 

 

Solution:

Try clearing the browser or device cache fixes the problem.