07.03.07 10:35:18 file_open('tags\scenery\halo_destroyed\bitmaps\hal o_explosion_flares.bitmap') error 0x00000002 'The system cannot find the file specified. '
Find that tag, for one.

07.03.07 10:35:35 the model 'vehicles\c_dropship\cd_gun\cd_gun' and the collision model 'vehicles\c_dropship\cd_gun\cd_gun' don't match (node counts don't match)
07.03.07 10:35:35 the object 'vehicles\c_dropship\cd_gun\cd_gun' will not be collidable
Try re-extracting the c_dropship tags. Though they may not be exactly causing your exception, it's always possible.