Some android hdmi sticks, cause bad firmware, have date and time very old because the OS can't update it automatically. If you have license failure of DroidMote Server or other paid app, be sure to have updated date and time of Android.
If your android firmware not automatically update date and time, you can use a free app that do this from google play.
Is normal that a license granted after a date can't work with a date of many year ago.

When you have problem with DroidMote Server, the first thing to do is:
Go in Settings -> Apps -> DroidMote Server
Clear cache
Uninstall
Reinstall from Google Play
Start the Server