Inputs and Configuration Page for the Palo Alto Networks Add-on are not working

[artioli]

Both pages for Inputs and Configuration are not working on the Palo Alto Networks Add-on. 

I am using a Splunk Enterprise Standalone with an NFR 50GB license. I've never had problems with this TA before, but recently I've redone my test environment to migrate from a CentOS to RHEL, so I reinstalled Splunk with the latest version and all apps on their latest versions as well.

Here are the errors:

 

What am I doing wrong to get these errors?

  

[PickleRick]

We can only see that the server is throwing a 500 error. We can't tell why. There should be something more in the logs. Check out _internal to see what's going on.