Pentaho 5 - Unable to remove and overwrite an Analysis Data Source

Hi,
I'm using Pentaho 5 and I can't remove an Analysis Data Source: it gives me an alert saying "Could Not remove: ...".
I can't even overwrite that Analysis Data Source creating a new one with the same Mondrian Schema: it gives me an error saying "XMLA Catalog already exists Mondrian File: ....xml".
This issue happened after I updated the Mondrian schema with a new version that probably was malformed.
Is there another way to remove that data source?

Thanks in advance