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java.lang.IllegalArgumentException: Path parameter "app" value must not be null. at retrofit.RequestBuilder.setArguments( at retrofit.RestAdapter$RestHandler.invokeRequest( at retrofit.RestAdapter$RestHandler.invoke( at com.sun.proxy.$Proxy75.getTargetServerGroup(Unknown Source) at$ Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall( at at$_resolveByTarget_closure2.doCall(TargetServerGroupResolver.groovy:67)