java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException	at java.io.File.<init>(File.java:277)	at io.grpc.testing.integration.TestServiceClient.runTest(TestServiceClient.java:260)	at io.grpc.testing.integration.TestServiceClient.run(TestServiceClient.java:200)	at io.grpc.testing.integration.TestServiceClient.main(TestServiceClient.java:84)