@Michael-Rudek like it said: just installed and activated the plugin and did nothing else with it.
08:54:13.608 [pimatic-mobile-frontend] info: packing static assets
08:54:14.239 [pimatic-mobile-frontend] info: packing static assets finished
08:54:14.251 [pimatic-mobile-frontend] info: rendering html
08:54:16.712 [pimatic] error: Startup error: Error: ENOENT: no such file or directory, open '/home/pi/pimatic-app/node_modules/pimatic-chronotherm/app/ct.html’
08:54:16.712 [pimatic] error:> at Error (native)
08:54:16.736 [pimatic] info: exiting…