[Moose-dev] userDefinedEdges

Hi I was following an exercise written by alex and the following code does not work | superclassEdges | luModel := (MooseModel allInstances last). luClasses := luModel allModelClasses. view shape rectangle size: [ :cls | cls queryAllOutgoingInvocations size ]. view nodes: luClasses. superclassEdges := view edgesFrom: #superclass. view treeLayout userDefinedEdges: superclassEdges. view shape line color: Color red. view edges: luClasses from: #yourself toAll: [ :cls | cls queryAllOutgoingInvocations atClassScope ] edgesFrom: raises an error several candidates. and I do not understand why. Stef