Membership Showing Errors

Hello,
We have Membership set up on our site, and this morning, a customer told me that she couldn't view her content.

I logged in, and there was a ton of error messages in the headers of the protected content pages.

Also, this is what I see on my members list (see attached screenshot).

Also, I had to choose a plugin from your dropdown above, but you don't have Membership listed.

Help?!

Thank you,
Sarah