Messages on boot "couldn't get file descriptor referring to the console" & "INIT: Id 1 - 6 respawning too fast disable for 5 minutes"

[John]

Hi list,

Both these messages occur on my headless and keyboardless Ultra1 (router) .
Its connected through serial port A to Minicom running on an old laptop.

Q. How do I correct the boot process to stop this happening, please?

TIA

John