I downloaded SMAPI a few days ago, installed a few mods and everything was working just fine. Right up until this morning. Now whenever I start to load it up I get the following error:

No idea how to fix this. :( The game seems to work just fine if I load it up without SMAPI, it's just SMAPI itself. I'm pretty technically illiterate so there's potentially something super obvious I'm missing here.

Hello @paradox0s. See this FAQs entry for some possible fixes. If you still need help, post a message in the SMAPI support thread. :)