Error when trying to diagram apex classes

[Kaatelars]

When I try to generate apex classes diagram, y receive the following error

Salesforce System Error: 1557396421-254147 (-116964763) (-116964763)
Error is in expression '{!doCreateDiagram}' in component apex:commandButton in page classdiagramcreator: Class.ApexParser.getCleaned: line 38, column 1
Class.ApexParser.parse: line 12, column 1
Class.ClassDiagramCreatorCtrl.doCreateDiagram: line 50, column 1

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