Error code 5 while running

I am getting an error code 5 with no description of error what does it mean?

Look into .log, .err and 001.out files (possibly left in the fluka_# temporary directory).

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There isn’t any temp directory created .
The run stops as soon as i start it

In fact, the run did not even start since the .flair file was embedding an erroneous .inp path. Loading directly the .inp file has solved the problem.