That is often an indicator that your map has become corrupted, for one reason or another.
You'll have to try to find a backup. If you are using JNGP, go to your JNGP folder and look under the "backups" folder. You should have some backup maps in there that will load correctly.
If you don't have JNGP, go to your Warcraft III folder, click "Maps" and open your "Test" folder. Hopefully your map is there.
P.S. Instead of taking a picture of your screen, you should be able to click "print screen", ctrl+c and ctrl+v into paint. If you can't do this (e.g. print screen doesn't work), then ignore this statement.