Download ZIP using java action

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Hi All,  I am trying to download multiple files into a ZIP. I have uses the following code from a java action and it just seem to keep coming up with error of contact system admin error. https://pastebin.com/PkJJCxZE  that is the following code. below are screenshots of the java action and microflow. Can anyone see a clear and obvious error or does anyone have a better solution of how to get ZIP files downloaded on Mendix.  Regards, 
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1 answers
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What is the error message you are seeing?

Have you seen the Zip modules in the Marketplace? Using these may be easier that writing your own.

https://marketplace.mendix.com/link/component/118584

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