Error while establishing a connection to Polarion

Hello Experts,   We are tying to use available Module from MarketPlace (PolarionConnector_BSH) to establish a connection.  when we are trying to login Polarion application via Mendix (once Polarion URL has been hit), it’s trigerring following Error  DOCTYPE is disallowed when the feature "" set to true.   Do anyone have idea or can provide a hint on how to rectify this issue? and to move ahead.    Thanks in Advance!!   - Anurag
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