Hi Randrik,
First of all. Welcome to Bannerlord Online.
Error messages and game freezes after character creation and prior to getting on the map, such as the one you experience, are almost always linked to having other mods installed for single player.
Mods installed, proceed here.
If you do have other mods installed, I recommend disabling them from the single player launcher. In most cases, this should resolve the issue. If it still persists after disabling mods, go to the Modules folder in the Bannerlord installation (\steamapps\common\Mount & Blade II Bannerlord\Modules) and remove the other mods from this folder. You can place them in a new folder (i.e. on your desktop). This way, if you want the mods back, you don't have to reinstall them and can simply drag them back to the Modules folder.
No mods installed, proceed here.
If you do not have mods installed, or the steps to disabling them didn't resolve the issue, the next step you should take is validating your game files through Steam.
I hope these steps are able to help you play the mod!