I know it's an older post, but if you are running Bannerlord on Windows 10, it may be caused by Windows blocking the downloaded .dll's in your mods. You can manually right-click on all of the .dll's in the different mod folders and 'Unblock' them or follow this guide to force Windows not to block stuff that you download from the Internet: https://thegeekpage.com/disable-blocking-of-downloading-files-in-windows-10/