AssertionError: Test node [test_rosjava/tester]

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Good night,

I am testing ROSJava and I am using the guide from: http://www.ros.org/wiki/rosjava

When I am executing the example: rostest --text test/rosjava_test.launch

I receive the following error

Traceback (most recent call last):
File "/opt/ros/diamondback/stacks/ros_comm/tools/rostest/src/rostest/runner.py", line 60, in fn self.fail(message) AssertionError: Test node [test_rosjava/tester] does not exist or is not executable

I would like to know what is the problem.

Cheers

Juan Antonio