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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)