do you mean
"can't find map maps/sw_el_kef.bsp"?
if so then find sw_el_kef.pk3
e.g.
http://www.seashadow.it/listing/etmain/sw_el_kef.pk3
or
http://maps.arni.name/etmain/sw_el_kef.pk3
etc...
add to Wolfenstein - Enemy Territory/etmain/
if the message really is "can't find map maps/sw_el_kel.bsp" (l not f)
open fritzbot/Fritz0.pk3 with winzip or winrar.exe etc.
Extract and check file scripts/fritza.campaign with notepad.exe.
There may be a mispelling.
Also check /fritzbot/scripts/... for similar campaign files.
http://forums.bots-united.com/showthread.php?t=5072