IIRC, There's two keyfiles you need -- you should already have one, and the program should generate the other for you. It looks like this step is completing successfully, which is good. (Because if it didn't, you'd be totally screwed, with no hope of getting it to work, short of copying someone elses' keys...)
Anyhow, after they are created, I think they need to be moved to the proper location(s). Seems like it needs one in L: and the other in the Miami directory? Wow... It's really been a long time since I set up Miami. Don't take my word on that, though. Literally, it's been about 7 years since I last configured a Miami install! It seems like I ended up using SNOOPDOS to figure out where Miami was looking for the keyfiles, and then copied them there. Unless someone remembers better than I do, you'll probably have to do the same. ;-)