A Web Part you attempted to change is either invalid or has been removed by another user

I encountered the following error today in our SharePoint 2013 environment while simply trying to move a web part to another web part zone:

A Web Part you attempted to change is either invalid or has been removed by another user

Of course, I went to Google first and found several articles on the subject, none of which fixed the problem. Then I found out from the SQL DBA that the SQL transaction logs had filled up the drive on the SQL Server.  After the transaction logs were backed up and shrank, the error has gone away.

So add “check to see if you’re out of disk space on SQL” to the various remedies you pursue to resolve this issue.  It worked for us.

<sarcasm>And thanks to Microsoft for such a helpful error message.  </sarcasm>

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