Those are just FrameXML errors dealing with loading files, iirc. To enable the taint log, type /console taintLog 1 (I believe that's the proper casing) and reload/relog. After you witness the problem again, log out and you will see a taint log file in the Logs folder. To turn off taint logging, replace the 1 with a 0. Taint isn't always a bad, thing, though, as most mods will "taint" blizzard code from hooks, variables, etc. The problem is when you get the "An action has been blocked by an addon." message in your chat frame.
Elloria - if you don't know what's causing it, you *need* to disable your addons by halves to find what mod it is. Unless you wait and find someone who has already taken the time to do this.
You say you don't want to disable them because you like them. You can always turn them back on.
Plus, do you like them even when they cause you problems like this?