I have the same problem (same error code and everything), and I am on a windows so I have .cfg files set to open with Notepad. It is really frustrating as I can't play at all, and I don't know why ModLoader.cfg is blank since most other people's seem to have a list of mods with ON/OFF next to them. The wierd thing is that this didn't happen at first, it just started happening after my computer had to revert to a previous state because there was a startup error.