Went into my site to activate Contact-Form-7 plugin and the whole site was gone! Dashboard has a message which I cannot understand (I don't write html) that says:
Warning: array_keys() [function.array-keys]: The first argument should be an array in /home/diannet/public_html/wp-includes/theme.php on line 513
Can anyone tell me what this means? Why would my theme (F2) suddenly go belly-up when I have done nothing to it (wouldn't dare)? How can I get my site back up asap? (I de-activated and deleted the Contact-Form-7 just in case, but site does not come back).