Illustrator Error with CSV Files

Hi! We have a document with many variables that we have all linked. Whenever I upload an updated csv file using "Load Variable Library", I select "Yes" to overwrite the current variables and data sets. But I get an error message that says "The filter cannot complete because of an unknown error." I can only upload a new csv file if I unlink every variable and then relink them after the file is uploaded, even though the file is the same format with the same variables. Any fixes to this??