Error "the formula contains a syntax error or is not supported" when attempting to add custom content type to document library after SharePoint Migration.

Recently we had finished a migration from SharePoint 2007 to SharePoint 2010 and on one of the sites that created some custom content types we started to receive the error message

“The formula contains a syntax error or is not supported”.

We looked at the different columns trying to figure out which might have a calculated field, but could not find one. Finally we used PowerShell to get a list of content types and their fields. 

$web = get-spweb 
$web.ContentTypes > f:\fields.txt

After we opened up the txt document we did a search on Formula and found that there was a field called QTR that was using a formula.

The column 1Q did not exist so it was unable to calculate the value. 
We then changed the QTR content type from calculated to choice and this resolved our issue.