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Unable to initialize modular input "validation_mi"


I'm unable to use the Validate & Package function of Add-on builder. When I run it, it says 'preparing validation' then nothing, empty white results. All I can do is press the validate button again with the same result.  I've tried with other apps in the Add-on builder with same results.

I have a local instance of Splunk Enterprise running. Fresh install so v8.2.2 and App-builder is on 4.0.0. 

I did catch a notification in messages: 

Unable to initialize modular input "validation_mi" defined in the app "splunk_app_addon-builder": Introspecting scheme=validation_mi: script running failed (exited with code 1)..

Don't know what this means or how to fix it. Any ideas?

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