This occurs when your Warcraft III patch version is incompatible with the map. If you are using version 1.28 or newer, try running the map on an isolated version 1.26a game client. Alternatively, apply the 8MB map limit registry fix if the file size exceeds historical engine limits.
For the uninitiated, (Imbalanced) is a custom map modification of the original Defense of the Ancients. It takes the standard Dota formula and turns the dial up to 11. download map dota imba 387 ai full
Check these community sites (search for “DotA IMBA 3.87 AI” or “DotA IMBA v3.87e AI”): This occurs when your Warcraft III patch version