Client found response content type of application/xml; charset=UTF-8; nullvalueon='empty', but expected text/xml

We are migrating from Tibco to mulesoft.

We create a constructor of the service agent to pass user name and password.

For one of the services we get erorr as InvalidOperationException: Client found response content type of 'application/xml; charset=UTF-8; nullvalueon="empty"', but expected 'text/xml'.

I have replaced all he exinting Tibco constructor with mulesoft consructor to pass user name and password.