There are many articles related to this type of error.

In my case, unfortunately, it was easier (because i lost a day to resolve).

The project was present in a folder like this:

C:\Users\Morales\Documents\repo_progetti\PROMaster\new_branches\abc-gp-4.3-release\abc-gp-reference-games\abc-single-player-games\1234567890\clients_xxx\my_game_flash

However, when this was brought into a project like this:

C:\Development\PROMaster\new_branches\abc-gp-4.3-release\abc-gp-reference-games\abc-single-player-games\1234567890\clients_xxx\my_game_flash

The problem  disappeared 

I think it is due to the path that becomes too large because there are still folders inside windows and then fails to run as it should.

Annunci