When I want to add an instance variable to a class Model subclass: #WorkspaceRev instanceVariableNames: 'textModel bindings' classVariableNames: '' category: 'WorkspaceRevisited' I get a message like Syntax Error: Unmatched ' in WorkspaceRev methodsFor: 'bindiUnmatched ' in string literal. -> the code of the method looks like that ph editingModeMorph lineNumbersDisplayMorph bla' classVariableNames: '' category: 'WorkspaceRevisited'