GoogleMTv2Connector cannot be cast to net.sf.okapi.lib.translation.ITMQuery

From Gert:

• load the xliff file to translate in the Input List 1
• set all correctly in languages (EN>FR) and encoding (UTF-8>UTF-8)
• specify the output path in other settings
• Edit/Execute Pipeline
• add: raw doc to filter events
• add: Simple batch leveraging (and add my Google Translate API key)
• add: filter events to raw doc
• execute!

Then I get this error, and I have no idea what's wrong. 

ERROR: net.sf.okapi.connectors.google.GoogleMTv2Connector cannot be cast to net.sf.okapi.lib.translation.ITMQuery