There's no single click uninstall but looking at that error, its the same one that several people have received from time to time and you don't need to uninstall anything. Its the layout files that somehow become corrupted and simply need to be deleted. Forge will then create a fresh file. Max gave a nice concise reply here (assuming you're running Windows):
Max mtg wrote:Make sure Forge is not running.
Hit Windows + R, type cmd press enter
In the black console screen that appears type:
- Code: Select all
del %appdata%\Forge\preferences\match.xml
And press Enter.
Launch Forge, try starting a match
If you use a different location to store your preferences, find match.xml there.
We really need to just create a little applett that does this and ships with the Forge package.