In order for the import to work, the column headers must be in the first row of the file. Some header information is often added to the file when it is exported from Click n' Go. You will need to delete these lines to prevent the upload from failing.
Simply delete all rows above the row that starts "StudentID", including any blank lines and save the file.
Your SEEMIS data is now ready to be imported into Groupcall Messenger v5.