seiladvbx - That error is different. file not found refers to a file in the TS3 care files. This could be something simple as a music file you deleted and a file a mod changed. All it takes is to change the date of the file and you get this error. Sometimes you can download the patch directly.
check - http://forum.thesims3.com/jforum/posts/list/167572.page#1996083 or
check - http://www.simprograms.com/the-sims-3-patches/
if this doesn't work you need to save your data and uninstall and reinstall to restore unsaid file (I don't like it either but it's the only way I found that works).