I've dug my camera out of temporary hibernation but have a couple of problems with it, wondering if somene can please help me. I'm fairly new to all of this so I would appreciate "simplistic" language, please.

In auto mode - I am getting a message of [r11] on the screen display - can someone please tell what this error means as I can't find it in the manual. I am also unable to take photos in relatively dark situations, even though the flash pops up (and I haven't noticed this problem before).

In manual mode - the electronic display states F-- in aperature and --m in focal length. Can someone please tell me what this means?

Many thanks.