Unable to initialize modular input "validation_mi"

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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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Unable to initialize modular input "validation_mi"

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

A Four-Part Event Series: Full Stack Observability For the AI Era

SOC4Kafka - New Kafka Connector Powered by OpenTelemetry

Event Series: Level up your SOC: Advancing with Splunk Enterprise Security