Testrunner error: cvc-complex-type.3.2.2: Attribute not

I get the following message when running testrunner script from the command line but not when I run from the GUI interface:
WARN [AbstractSoapVersion] Ignoring validation error: error: cvc-complex-type.3.2.2: Attribute not allowed: encodingStyle@http://schemas.xmlsoap.org/soap/envelope/ in element Envelope@http://schemas.xmlsoap.org/soap/envelope/

How can I get rid of this?

Thanks
Robert