Nikon Coolpix L310 Memory Card Problem?

I've had my nikon coolpix L310 for almost two months, and it had been working fine. All of a sudden today, whenever I turn it on it says "This memory card cannot be used".It's the same card I've been using the entire time.It works fine when I take it out. I'm just wondering why it stopped working all of a sudden. I checked to see if it was locked, and it's fine.
>>> Nikon Coolpix L310 Memory Card Problem?

Nikon Coolpix p90? Should I buy it?

I was wondering if i could buy this camera! Can you please write a review about it or something? Really want to learn about it first and I want to be sure it's a good quality camera!
>>> Nikon Coolpix p90? Should I buy it?