Since Add-on builder is a developer tool, only the user who is the admin role can use add-on builder.
Frankly speaking, we did not test on the free license. As far as I know, when your trial license is expired, you can not use any ACL features in splunk enterprise. According to the stacktrace in web_service.log, I guess the ACL feature in your splunk might be disabled.
Can you confirm that the ACL feature in your splunk works or not?
If the ACL is disabled, the root cause of this error is found.
Anyway, there is a general question here.
Can add-on builder be used in splunk which only has free license?
My answer will be yes. We have no reason to reject users to use add-on builder. What I want is to make sure everyone can use add-on builder in a development env easily. Normally, a free license splunk means a test or development environment.
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