i was making a little game, and i was using My First Game tutorial and there type of map was called map file.dmp but all i see is map file.dmm i figured they were the same thing and i tried it but it said " Due to Compilation errors, the object tree cannot be trusted for map generation. These errors must be corrected before editing the map." what does this mean, what do i do and is the My First Game tutorial trustworthy?