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

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This exception has no message.
java.lang.NullPointerException:
at alluxio.client.file.FileOutStream.write(FileOutStream.java:303)
at alluxio.client.file.FileOutStream.write(FileOutStream.java:270)
at alluxio.examples.BasicOperations.writeFile(BasicOperations.java:86)
at alluxio.examples.BasicOperations.call(BasicOperations.java:72)
at alluxio.examples.BasicOperations.call(BasicOperations.java:42)
at alluxio.cli.CliUtils.runExample(CliUtils.java:51)
at alluxio.cli.TestRunner.runTest(TestRunner.java:148)
at alluxio.cli.TestRunner.runTests(TestRunner.java:121)
at alluxio.cli.TestRunner.main(TestRunner.java:98)

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