Before the first test table, you should add three important lines:
!define COMMAND_PATTERN {%m %p} !define TEST_RUNNER {C:\Probjects\HelloWorld\binary\NetRunner.Executable.exe} !path C:\Probjects\HelloWorld\bin\Debug\FitNesseHelloWorld.dll
The command template is described first (for Java - {java -cp% p% m}) The second path to the runner (I'm not sure if this is required for the Java application) The third has a path to your test library (to your jar file)
https://github.com/imanushin/NetRunner/wiki/Create-the-first-test
I could catch this error in my local environment. Check the path to your Runner, because the same error is displayed if the path is incorrect.
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