Writting a converged application (sip-diameter) I am getting null when I try to call the diameter no

The SIp part works fine, expanded the deployment with diameter and now when I try to gt the diameter node I get null.

If I try to "run" the diameter.xml as a stand alone I also get an error

oracle@core custom]$ java com.bea.wcp.diameter.Node diameter.xml

Exception in thread "main" java.lang.IllegalArgumentException: Configuration file '/home/oracle/Oracle/Middleware/user_projects/domains/sip2/config/custom/diameter.xml' contains no default configuration

        at com.bea.wcp.diameter.Node.createNode(Node.java:185)

        at com.bea.wcp.diameter.Node.main(Node.java:586)

Diameter.xml

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<?xml version='1.0' encoding='utf-8'?>