language and mapinfo screwing up

Hi!

I am very new to wad editing and just ran into a problem.

I wanted to change the names of the maps in game for my vanilla doom1 replacement. I extracted the language and mapinfo file from the zdoom.pk3 file and edited the names of the maps etc. I named the files language.lmp and mapinfo.lmp and imported them to my pwad through SLumpEd.

Now, when I start my wad in zdoom I get an error in the console saying: "Things not found in e1m1"

Since I'm very new to wad editing I don't understand what's wrong at all.

EDIT:
Ok.. 1 min after i posted this I found the solution.