Opennos compilation error

After installing everything, and compilated the Opennos solution, i've having this problem, and I really don't know if it's a port problem or not. Please, help me :confused:

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Hope u can help me solving this problem. Thank u so much :)

Just start the master server...

what do u mean for "master server"? Because I've to change all "localhost"with another name cause of a my pc problem, and I don't know if it can be a problem.

Edit: Solved, it was a very stupid problem XD
Can be closed

Thanks :c