Icon Paths:
Icons must have their paths set correctly to be used in Warcraft III maps. Open World Editor's Import Manager and check to make sure you have set the right path for each icon.
We are going to use the path of a sample icon: BTNDragonBreath.
You can find it here.
ReplaceableTextures\CommandButtons\BTNDragonBreath.blp |
ReplaceableTextures\CommandButtonsDisabled\DISBTNDragonBreath.blp |
ReplaceableTextures\PassiveButtons\PASBTNDragonBreath.blp |
ReplaceableTextures\CommandButtonsDisabled\DISPASBTNDragonBreath.blp |