How to solve response code 500 in cytargetlinker? - cytoscape

Got a problem when I followed the tutorial 1 in cyTargetlinker. Every step is smooth until I reached step 4 after I selected "2" for the "overlap threshold" functionality. It gave a sign "Caught exception executing task" with a statement "Untitled (org.cytargetlinker.app.internal.tasks.FilterOverlapTask). I further checked the automation and it stated that there was an error 500 response code. Anyone know how to solve this problem?
I download Cytoscape 3.8.0 and intalled cyTargetLinker app.
Thanks.

An error 500 indicates a problem with the CyTargetLinker web service. I know that some of the web sites at Maastricht have been offline due to a recent hack, but I don't know if that's the problem. You might try e-mailing the App authors (go to http://apps.cytoscape.org/apps/cytargetlinker and click on e-mail).
-- scooter

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