@nayan_wylde We're just using the Maven default repository, pre-configured by Databricks.

@szymon_dybczak Sure! DBR is 15.4, but I've tried with 16.4 as well. 

In another workspace that doesn't have unity catalog enabled, I was able to install and use the Maven library with no issues. The cluster configuration was the same, only access mode was different: set to 'No isolation shared'.  

I tried the 'No isolation shared' access mode as well in my UC workspace, but still the same error.