The error happens for instance in RWDiagramElementGroup. The coding checks for classes wtih the statement:
each famixElement class asString = self aFAMIXClass,
But the famixelement is a 'FamixStClass' not a #FAMIXClass
Start to to support Smalltalk Images in this versions.
New Check Methods isFAMIX... that check for FamixStClass, ...
determineUniqueKey replaces FAMIXSt with FAMIX and famixst with famixst
But there is still something to be done.