Comment #1 on issue 972 by benjamin...(a)gmail.com: MNU GLMTreeMorphNodeModel>>previousLink: http://code.google.com/p/moose-technology/issues/detail?id=972 Not sure if this is the final solution, but error is avoided by adding asOrderedCollection... GLMTreeMorphModel >> roots: anObjectOrCollection roots := anObjectOrCollection isCollection ifTrue: [ anObjectOrCollection ">>"asOrderedCollection"<<" collect: [:each | self nodeModelFor: each ] ] ifFalse: [ OrderedCollection with: (self nodeModelFor: anObjectOrCollection) ] ------------------ Otherwise... * anObjectOrCollection is a FreeTypeCacheLinkedList, whose #collect: & #addLast: methods require elements to understand #nextLink and #previousLink * block-variable :each is a FreeTypeCacheEntry, which does understand these * the result of [self nodeModelFor: each] is GLMTreeMorphNodeModel, which does not -- You received this message because this project is configured to send all issue notifications to this address. You may adjust your notification preferences at: https://code.google.com/hosting/settings