I am very new to modding / mapping and am following a tutorial where so far a room has been made and textured and a solo spawn point has been placed as well as 4 script_structs for multiplayer spawns. They then showed how to mod and compile it. I did notice that during modding it was failing to find files but said that everything was successful so I assumed it was fine, but upon compiling when it tried to launch I received a window saying:

"Expression:
      num_entities != 1

Module:   C:\Program Files (86x)\Steam\steamapps\common\Call of Duty World at War\bin\cod2map.exe
File:      E:\cod5\cod\modtoolssrc\cod2map\map.ccp
Line:      1899"

I have no idea what this means and would be glad if anybody could help. Any help is greatly appreciated!