Where did you download the copy of the script you are using now, because it could be an old version. The most recent version, prior to the small fixes I just did, was 1.9.0 (now 1.9.1). To check your version you can open the ZRPG.pas file in notepad, or any other text editor, and look at the very top of the file.
FIX FOR PROBLEM:If you haven't edited any of the files inside the zrpgevolved folder manually (skills.txt, bots.txt, anything in the bots or info folders)
you can just reinstall the new version of the mod from the file attached below (zrpgevo 1.9.1.zip). Open the zip file, go into the zrpgevo sub-folder, and copy the bots and scripts folders into your server's main folder, overwrite and merge when asked. Otherwise, you can follow the instructions below:
If you need to preserve custom file edits (unlikely):
Delete your existing ZRPG.pas file, and replace it with the one attached to this post.
Make sure your scripts/zrpgevolved folder has AT LEAST the following files and folders:

If you are missing any files or folders, copy them over from the .zip file attached to this post.
EDIT 9/7/2015:Attachment removed, as it is now an old and defuct version, go
here (http://forums.soldat.pl/index.php?topic=41709.0) to download the most up-to-date version.