I've got the following error message:
"Error: Couldn't remove old operator type definition sesi_temporary::Sop/box
oplib:/Sop/box?Sop/box Error(1): Expecting open brace"
First, I ignored it because it didn't seem to have any effect on functionality. But, I realized that "box" object does not work with error message of " 'NonType' object has no attribut 'set' ".
What can I do for this?