New build issue --- err:mintemp -- ***HELP***

Whuz up my virtual colleages !! Need HELP !! New to 3D printing – Just finished building my Vertex k8400 — itching to build something with it for the first time but have run into a problem — uploaded the correct software for single head & pushed Marlin.ino to the flash chip. All loading correctly, but I am getting error message Mintemp on the printer LCD screen. ??

Check the extruder connector if its plugged in properly (mainboard and on the moving head)

Best regards,

Also check if the Firmware version on the board is the same as the version you flashed.

Check the thermistor for proper connection (middle connectors)

I think I had the same issue if I remember correctly.
The heater cartridge cable-connector didn’t make proper contact.

Thanks for all who have responded thus far – it is greatly appreciated – I have checked the firmware on the LCD screen & it shows the exact firmware that was loaded – the firmware is the latest for the single head vertex 1 head V1.1 — also I forejudged to my computer the repetier printer host software – if I’m not mistaken there is only one host software – when I open it & look at the printer settings under extruder settings it showed 2 but I have not changed it to 1 — double checking all connections in a little bit – will respond again soon – thanks again everyone
Todd in the USA