Problem:

Whenever I tried to create a custom game(single player /w only 1 bot), if I was originally in the custom game lobby(where it displays a list of customs games), it will throw me an error whenever I add the bot and click play game.

Recreating
1. Click Play
2. Select Custom
3. Click Join Game
4. Click Create Game
5. Enter w/e password
6. Click Add Bot
7. Click Start Game

Major/Minor...can't really say

try to create a custom game without changing the game's name and/or password