Some people are having this sort of issue. We don't know exactly what's causing it but it seems that you can solve it by uninstalling previous versions of Mino Hotel from your device, if you have any.
Sounds like maybe your app is generated with the same package name, but a different signing key? That would cause a conflict which triggers an error when attempting to install. It's a safety feature to prevent malicious apps from 'overwriting' legitimate apps.
nanoff's computer unceremoniously died earlier this year and we lost the signing key, so we were forced to make another one. Thank you for telling us this, it explains what's happening.
You might have already found solutions for this problem now, but I'd like to mention that you can create a copy of the keystone file and keep it in several places. My previous workplace had it checked into git & on two separate USB drives. :)
