I am getting the same thing when trying to use Splunk Windows and AWS addons. I just installed them and when they try to load the page the page shows for a quick second and than see that error message
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Did you ever get a answer as some of the apps. i was able to install the app but once i log into splunk and try to bring up the app i get that same error message. I even chown and chmod my /opt/splunk directories and get this on my Splunk Addon for AWS
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