add and subtract error in ftp backup migrate and ctools
error2
Revert "error2"

This reverts commit c11940ebb7ef226f651c0ab7d278edf054785a3b.
Revert "add and subtract error in ftp backup migrate and ctools"

This reverts commit a8cae1619da2b45d56e84a8b01db5b3232fb09fc.