I'd like to second this. Every time I'm running into the same error; The installation works fine, it loads and works properly when I first install it. After that, it will never open, an errors with a message stating that Java has issues and gives me some code behind it. I've installed multiple times with the same results.
Guess I should update: I saw the post and went to check my logs. My logs stated absolutely nothing about the error I was having so it made me curious to check what was going on. The dates on them didn't even have the same day haha. So I went to that specific folder and clicked to update (nothing happened) and then started the program and it worked, pinned to taskbar, closed and reopened, and it worked again, so I should be problem free.
To PintarolasPink, assuming you're on windows; Go to your Users > (yourname) > AppData > Local > Innkeeper >app-0.4.12 and just try to update and start the app from there. If you have the same issue I did, it should work :)
Thanks for checking in Molster; I just had a bad shortcut situation haha!