I received that same "The Camera Cannot detect light in M Mode". The screen showed the ghost of a bleached image near the top.
I looked around Starlinks for a while & changed a camera setting. Unfortunately, I'm not much help because I don't remember where it was or what it was called. It did not say "M Mode", but I think the title did begin with the letter "M" which gave a hint.
I sympathize with your frustration. I'm not a photo freak or geek but just a want-to-be pilot that gets very confused. If I chanced upon the solution, your odds are excellent.