Heatertimeout plugin

i download Heatertimeout plugin to my OctoPrint with my printer Prusa MK3 ..
when its activated the printer cooling down and the hotend nover heat again
i got this massage on OctoPrint
" Error reported by printer
Your printer's firmware reported an error. Due to that OctoPrint will disconnect. Reported error: Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting) "
iam not good in code so please if any one know how i fix this ... pleasse help me ..
thank you ..