here´s a little experience i made. it took me nearly 2 hours before i realized what exactly went "wrong"
i´ll share with you so hopefully you won´t make the same mistake.
in the end, it worked for me to simply delete the 3 mentioned files, BUT:
at first, i cut them out and put them into a new sub folder in the mesh folder (named somewhat like .. "old mesh" or so - i admit, i´m a careful person, so i didn´t just want to delete them. plus, i slightly altered the files´ names so the game would in case not recognize them). it did not work like this, the error stayed the same.
apparently, the game in fact simply counts the amount of files in that mesh folder - of course, the number had stayed the same in the upper case.
so i simply cut out the sub folder containing the 3 files and put in on the desktop . badabing, worked perfectly
so, in the end: if you do not delete, but only place the files somewhere else, be sure it is NOT in the mesh folder or any sub folder of it.
hope that helps, gl hf @ all