Comment #6 on issue 3815 by stephane...@gmail.com: Filing in Class comments raises an error http://code.google.com/p/pharo/issues/detail?id=3815 A dirty solution is to remove the class comments change notification from the fileIn. fileIn "File the receiver in. If I represent a method or a class-comment, file the method in and make a note of it in the recent-submissions list; if I represent a do-it, then, well, do it." Cursor read showWhile: [ | methodClass aSelector s | (methodClass := self methodClass) notNil ifTrue: [ methodClass compile: self text classified: category withStamp: stamp notifying: nil. (aSelector := self methodSelector) ifNotNil: [ RecentMessageSet noteMethodSubmission: aSelector forClass: methodClass ] ]. type == #doIt ifTrue: [ ((s := self string) beginsWith: '----') ifFalse: [ Compiler evaluate: s ] ]. ]