I know I, and I bet some other people would be curious as to how fatal errors occur, maybe anybody that knows a reason as to why fatal errors occurs could post it here and possibly help mapmakers in the future .
I know two reasons,
1. If you give a unit a hero inventory, and then that unit picks up a tome (the unit does not have stats, and is not a hero itself, the game will fatal error.
2. I am pretty sure that if you create an extremely laggy ability that creates an extremely large number of special effects / units / etc. the game will become extremely laggy then fatal error.
I know two reasons,
1. If you give a unit a hero inventory, and then that unit picks up a tome (the unit does not have stats, and is not a hero itself, the game will fatal error.
2. I am pretty sure that if you create an extremely laggy ability that creates an extremely large number of special effects / units / etc. the game will become extremely laggy then fatal error.