Other software applications may conflict with Medieval 2 Total War, causing the "unspecified error". Try closing all non-essential applications and see if the error persists.
This is the #1 solution for 90% of unspecified errors. Other software applications may conflict with Medieval 2
You click on a princess to marry her off, or a diplomat to bribe, and the game dies. For mods: Many large mods (Stainless Steel, Third
The game engine (originally built for Windows XP) doesn't handle certain modern system events gracefully. Instead of a specific error code (like “missing texture” or “out of memory”), it just crashes with this generic message. Common triggers: You click on a princess to marry her
If you have the Kingdoms expansion (which most people do), the Steam launch path is often broken. The standard launcher tries to launch the expansion, fails to find files, and crashes.
The Batch File Method (Highly Recommended): Instead of using the default "Play" button in Steam, try launching the game directly via a batch file. This bypasses the buggy launcher.