"I'll wait for your reply..." I hope I didn't keep you waiting too long :)
Okay, yes. I found what I suspected would be there. Here's the first error line:
sort.exe: close failed: D:\slate\Workspace\TRAININGS\smt-tm-en-hu-eu_enhu\temp\trainer,hu,210,0,train-tm\5\sortYy7ce9: Bad file descriptor
In short, you ran out of free hard drives space when the open source components were doing their work. It's very difficult (almost impossible) for Slate to catch errors because the open source scripts hide the errors. We do our best to test/double-test for errors. When we can't catch them, a failure happens way "downstream" from the original error. In this case, the error (your screen shot) manifested itself about 6 steps later when the corrupted file was needed as the input for another step.
You did all the right things. You set your workspace to another hard drive (D:\slate) that I'm assuming as the maximum free space. Can you tell me how much free space is on that drive?
From here, this is what I recommend:
It's impossible to guess how much free drive space you'll need to build this mix of TMs. My best guess is 2x or 3x as much free space as you have now. Your other option is to cut back to only your own TMs.