This error is populating due to the value mentioned in the quotation marks not being a valid type to match with in Common Ground.  This is normally caused by the value in CG not able to accept special characters, numbers, or other values.  If you have performed a custom import or modified a record manually during the time of the last previous sync check the upload file/ or record to see if this value is included.  If it is change the data type to match what the corresponding field in CG will accept and re-upload the file.  Once the data has been corrected you can restart the sync and it should succeed.