As for a quick response, the mission tries to launch itself -> i go to techroom, select it, then it loads... and just as briefing is about to show up, it doesn't. I get that error.
Yes, this is custom mod of mine, but i don't believe anything should be wrong with it, previously everything was working fine with it, but it started to happen just recently no idea why... maybe its hardware related? I changed my machine recently too.
P.S.
As for live debuging... I am unable to provide the software you've linked. My network is currently a big piece of crap, so larger files just won't go through.