The map may be incompatible with the Minecraft version you've loaded it with. Are you using a quite recent version? If so, which one?
To turn cheats on you can host a LAN and turn cheats on in the LAN options.
I am using 1.10.2 on Minecraft I am also using single player on it.
Yo can i do something in this world? cause im creating a server for my friends but it wasn't out for pubic so can i be creative or put more stuff that i planned? cuz your map was amazing
Edit:im using 1.12.2 with mods so i can do more stuff
Hello Fish95, it appears that your 1.7.10 vertoak city map is corrupted, there are random deleted and replaced chunks on the outskirts of the city, and cut-off chunks where regular terrain used to be, also do you have an official discord server?