SyncProxy not working in android version nougat and above

[gaurav19643]

06-09 20:03:34.582 5393-5418/com.example.gwttest E/AndroidRuntime: FATAL EXCEPTION: Thread-4
Process: com.example.gwttest, PID: 5393
java.lang.ExceptionInInitializerError
at com.gdevelop.gwt.syncrpc.SyncProxy.setBaseURL(SyncProxy.java:530)
at com.example.gwttest.Mpsend$1.run(Mpsend.java:31)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.NullPointerException: Attempt to get length of null array
at com.gdevelop.gwt.syncrpc.RpcPolicyFinder.searchPolicyFileInDirectory(RpcPolicyFinder.java:272)
at com.gdevelop.gwt.syncrpc.RpcPolicyFinder.searchPolicyFileInClassPath(RpcPolicyFinder.java:243)
at com.gdevelop.gwt.syncrpc.SyncProxy.(SyncProxy.java:617)
at com.gdevelop.gwt.syncrpc.SyncProxy.setBaseURL(SyncProxy.java:530) 
at com.example.gwttest.Mpsend$1.run(Mpsend.java:31) 
at java.lang.Thread.run(Thread.java:761)