**update Pi software, see if process is running (its not)Octoprint.log (2.5 KB) **
Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
Additional information about your setup (OctoPrint version - 1.4.0, OctoPi version-.17, printer, firmware-prusa mk3s 3.18, browser-chrome, operating system-Raspi 4 octopi, ... as much data as possible)
thei started after I updated ToughHI helper .0.0.3 to fix the login issue - this has happened on two of my MK3s machines running the SAME hardware
But based on this specific ticket....if you manually edited your config.yaml file you may have corrupted it. Verify the spacing is the same relative to the other settings, it may not be 4 spaces for each indentation, but might be 2 spaces instead.