Running AdvancedCourseStarterPackage in Mendix

Seems that this project was last saved in Mendix 7. I, but I am trying to run it in 8.12. I upgraded a couple of the widgets (e.g. slide button) to resolve the errors in the editor, but get Java compile errors when trying to run locally e.g.      [javac] C:\Users\cd8ttt\dev\Mendix\AdvancedCourseStarterPackage\javasource\appcloudservices\ error: cannot access DataHandler     [javac]         return Base64Utils.encode(bytes);     [javac]                           ^ Has anyone updated that project to run in Mendix 8.12 Thanks Peter
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