Unhandled exception

I keep getting this error repeatedly

Unhandled communication error
There was an unhandled error while talking to the printer. Due to that OctoPrint disconnected. Error: Printer halted. kill() called!

It’s hit or miss sometimes I connect to the printer just fine other times (like tonight) everything I try doesn’t clear this error reboot, power off etc.

which version of the firmware are you using?

1.8.6 and octo-print 1.2.18 which is another problem trying to upgrade fails. today I was able to connect but I still can’t get anything to print

I followed your post OctoPrint with OEM Hardware Tutorial (FlashNGo)

ya, upgrade needs some work.
at least you’re getting further. so now that it ocnnects, whats the error?