Debug mode, when enabled, creates a log text file named errors.txt which is found in the "Logs" subfolder in the "Data Files" main folder.
This enables the user to view what exactly went wrong in the game, if anything.
To enable Debug mode Open the "Data Files" folder. There should be a "config.ini" file. Open with Notepad and you should see this ------>
Go down to "Debug" and replace the 0 with a 1.
Basically the 0 means that the option was OFF. By entering a 1 turns that option ON.
Save the config.ini, and restart the game. You are now in Debug mode.