You have two options:
1) You can type /resetsecuremaps
or
2) Go to your ac directory and open up the config folder. In there should be a file called "securemaps.cfg"; open that file in notepad and delete the line that has your map's name in it, and save it.
1) You can type /resetsecuremaps
or
2) Go to your ac directory and open up the config folder. In there should be a file called "securemaps.cfg"; open that file in notepad and delete the line that has your map's name in it, and save it.