BlackCipher.aes - Application Error while on maple

Earlier this week, everything was fine, but Wednesday, I started getting this error while on maple, and it dc'd me due to it.

 The Error

I've already replaced BlackCipher, and I thought that worked, but then I got the error again last night. I really don't know what's causing it, nor how to fix it, and I really don't want to redownload the game. Does anyone know what might be causing this/how to fix it?