@drx1984
Goodmorning,
I think the module is not install correctly
have you follow the instructions https://github.com/shbatm/MMM-RTSPStream
You can also
go into terminal.
cd ~/MagicMirror/modules/MMM-RTSPStream
git pull
npm install
If that i’s not working I can only suggest that you delete your current installation of the module and re-install it.