I had a class Value with an attribute value that had a comment Tag symbol in ClassDiagram 1.
I deleted the value attribute in another diagram.
Then I opened ClassDiagram 1 and got this exception:
java.lang.IllegalArgumentException: value is not a member of Value
at com.objectgen.classes.ClassSymbol$AttributePos.<init>(ClassSymbol.java:1665)
at com.objectgen.classes.TagSymbol.attachLineTo(TagSymbol.java:193)
at com.objectgen.classes.CommentSymbol.start(CommentSymbol.java:87)
at com.objectgen.classes.TagSymbol.start(TagSymbol.java:101)
at com.objectgen.graphics.Diagram.startAllSymbols(Diagram.java:944)
at com.objectgen.graphics.Diagram.paintSymbols(Diagram.java:903)
at com.objectgen.graphics.swt.SwtDiagramCanvas.paintDoubleBuffered(SwtDiagramCanvas.java:458)
at com.objectgen.graphics.swt.SwtDiagramCanvas.paintControl(SwtDiagramCanvas.java:403)