Hi Jürgen,

That’s very strange… not sure why Android would disallow the installation. Can you double check that you fully uninstalled the app? Pulling the icon in to the trash from your home screen removes the icon but does not uninstall the app on some devices. The most complete way I’ve seen is Settings->Application Manager->Mooshimeter->Uninstall

I’m working on improving error reporting within the app, if you can get a new version installed hopefully we can figure out what’s happening in your phone. Sorry for the trouble
~James