Why does it say memory card error on the screen

Hi there, For few reason camera showing memory card error.
1. Memory card damaged.
2. your memory card finished is life time storage memory.
3 . virus infected.
4. If your memory card storage capacity more than camera support card then its also show to you. For example your camera support maximum 2 GB card, but your try to use more than 2 GB memory card.
I suggest your remove the memory card and scan by updated antivirus. After that, if not working then fomat it and try.
Thanks & waiting for your feedback.