I am trying to use Video Flow, but if I try to connect
two morphs I get following error:

VFInputPlugMorph>>doesNotUnderstand: #neighbors

This error occurs in method:

putPredecessorBoxesIn: aSet
    "private - answer a collection of boxes accesibles"
    self neighbors
        do: [:eachPlug | ""
            (eachPlug isKindOf: VFPlugMorph)
                ifTrue: [eachPlug box putPredecessorBoxesIn: aSet]]

Can somebody help me?

Madis