make sure your file paths are correct, and make sure you MANUALLY add a "\" behind the last file folder location. The editor doesn't add this hash when you set your folder locations.
EX: "C:\Program Files\EA Games\Battlefield 1942\Mods\BF1942\bf1942\levels\" <--- notice that last hash...
EX: "C:\Program Files\EA Games\Battlefield 1942\Mods\BF1942\Objects\"
EX: "C:\Program Files\EA Games\Battlefield 1942\Mods\BF1942\StandardMesh\"
etc...