Issue with java - XML / Property is not recognized

I'm IT student in France and I feel sad with an issue in Linked Data ...

I've already done a java app to post a SPARQL query with JENA API. It works fine.

But I'm seeing the semantic web client (framework for Jena and SPARQL 1.1 multi - endpoints) and I've a issue ... I'dont know how to fix. When I post this request with my first app it's work, with the new one, warning message.

This is the warning message :

Warning: org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser: Property 'http://ift.tt/1rdd56E' is not recognized.

I think it's why I have no answers on my query ...

Thanks for reading.