I get this error message "Multiple master files selected for load, operation aborted" in the FNV geck.

I modified my geckcustom.ini to read "bAllowMultipleMasterLoads=1" and added that line to the file

geckprefs.ini as well. Both of these files are set read only.

I still get the "Multiple master files selected for load, operation aborted" whenever I try to load an

esm and esp file at the same time, even if only one esm is selected.

What can be done to eliminate this error besides "bAllowMultipleMasterLoads=1", which I have already

tried?