Most probably there's something missing, a file which is created or morphed within the script, something like that.

From the manual:
"level "levelname";
All entities from this map file are automatically included into the published game folder or the resource."

Search in the scripts for 'create' and 'morph', and 'bind' them:

From the manual:
"bind <filename>;
The given file will be copied to the game folder by WED's Publish function, and included in the game resource by WED's Resource function.
Remarks:
Only for special purposes; all files given between angular brackets will be included anyway. You can define any number of bind files."