Error loading user interface (0.6.1 beta)

[Bobob]

I lost a pugilism match, approached the roster and got this:

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I clicked around a bit, and then got this:

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Clicking "ok" wouldn't do anything. Maybe the error kept popping up instantly. I had to alt+f4 and it worked fine afterwards.

Edit: I won a pugilism match this time, approached the roster again and the same thing happened.

Edit:

This happens every other time. I finish a match just fine, then when I try to enter the next one it does the error. This time I managed to exit the menu, and got these:

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[burgzaza]

I just got the same bug when clic on the matches scroll, after I won an Elimination.

 

[Cores]

Same here, reinstalled the game, played arena for a bit and then after winning a boxing match I got the same error.