Tommy of Escondido said:
"Warning: No entities exist in hull #, no filling performed for this hull"
Fairly obvious, you made the map without putting point entitys, like player starts. However, often this error will come up because an entity is outside the map; and other times this error will be bogus and something else lies behind it like: the "too many wads" or other odd errors, or you forgetting to export into .map format in WC, or a leak, or even a corruption of your level files! This error seems to get pulled up often for the wrong problem.