Cannot create unknown type '{http://schemas.uipath.com/

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Got this error message:
#1680 - while executing ‘robot_name’
Error message: Cannot create unknown type of

Re-referenced the custom packages and publish the project again to orchestrator which enables the custom package references back in active/restored as expected. It worked for me.

Apparently the reference got broken in the orchestrator and republish helped my case to re-establish reference to orchestrtor

Thanks