The overworld, mistake

Questions
1

I was doing an overworld, when the engine enters (or tries) to that overworld, it doesn’t recognize it
Engine Fatal Error 13_5_2023 21_44_31

Fire EmblemLT.ltproj -- LT Maker 2023.04.08a 13_5_2023 21_44_46
Fire EmblemLT.ltproj -- LT Maker 2023.04.08a 13_5_2023 21_44_461366×705 132 KB

am i typing something wrong?