User blog comment:Hexostatus/ROBLOX Refusing to work due to the system error/missing file./@comment-31486088-20170311151327

Hm, that never happened for me (then again, I rarely play PC ROBLOX). I'd suggest checking to make sure you have all your ROBLOX files.

I just checked ROBLOX's FAQs and there's a section for technical problems, you might want to check there to see if any of those apply to your issue or, if those don't apply, contact ROBLOX and see if they know what's happening.

↑This is just my best guess since I don't play ROBLOX on my computer anymore, someone might have more information though :P