We had this same error and found that one column of data had a weird tab space after it. Doing a find and replace before we get the collection fixes our issue.
Actually, you can use LIKE https://portal.blueprism.com/customer-support/support-center#/path/Automation-Design/Studio/Visual-Business-Objects/1194312962/What-is-the-syntax-for-an-expression-used-by-the-Filter-Collection-action.htm-------------------...
