The operation cannot complete because of an unknown error in Illustrator

Hey guys. I get the error message "the operation cannot complete because of an unknown error [CANT]" when I open up an SVG file I used Illustrator to create. It's a set of about 200 symbols and I get the error around half of them. The problem is that the file doesn't open at all so I cannot resave it, nor do anything with it. And there's no reason to think that they got corrupted anywhere along the way, but there might be some problem with looking for a font that doesn't exist... just a hunch. I preferably don't want to redraw 100+ symbols. And it all worked a week ago, maybe its the new update of CC that did this.

Anyone else got a solution to this?

~sometimes this also happens in saving works to .ai file
i re-install Illustrator and its now back to normal, i had read a blog that this mostly happens to portable version of apps and unlicensed.
you can try to go adobe.com/support for concrete info