Have you tried reading the first card on a PC? On the second card, was the switch on the side in the unlocked position? I've found on some SD cards the switch can become loose which means when you put it into the camera the switch moves over to the locked position which prevents the camera from writing to it.
For the first memory card, when you have filled it up how do you wipe it to start taking photos again, do you just delete all photos or do you format the card? Getting a memory error is not unusual if the card hasn't been formatted before taking a new set of photos so the two errors may be a coincidence but it could be a flaw in the camera unfortunately.
John
Thanks John
I hadn't realized that the card had a lock on it, this solved the problem on one of the cards & I'm please to say that my camera in full working order again
unfortunately the other card is still not working, this one has lost its tab on the lock, and this one is saying the card is locked. I've tried putting tape on it as suggested by another website, but still not working, I do save the pics onto my computer so it will only be a few pics that have been lost, so the outcome is not a big lost.
I've never formatted the cards, & the cards are a few years old, is this something that should have been done?
I just delete them once I have saved onto the computer & then start using them again.