That would be correct if it was a error in the actual program, but its not. Launchbox does not know how any emulator needs to be setup, this is because you can use any emulator you like and your roms can be in any file format you like, there is simply no right or wrong way to import a system, it completely depends on the emulator and the files being used.
This is not a lack of error logging, in the UI, simply because there is no error happening, the only error here is between chair and computer.
Also why are you calling the platform Sega Dreamcast when that isnt the platform you are importing, that isnt going to help matters either, and again thats a choice you have for some reason decided to make and not a problem with Launchbox, it just does what you tell it, if that info it is fed is just a jumbled mess and incorrect what is Launchbox supposed to do about it?