Cannot write to cache?

The other night I added a page (sumo.holyroller.org/tadpoles/), added a flash video to it (via the WP-FLV plugin). I viewed it, looked good. The next day I needed to add another flash video to it, and I get this message:

Couldn’t write to: (deleted the root directory info)
.../sumo.holyroller.org/wp-content/cache/wp-cache-4aa4d65ecda79bcb992777362dfb0d58.html

Tried the main page and get this message:
.../sumo.holyroller.org/wp-content/cache/wp-cache-68117f5374448d6532962968f58fba0d.html

I can get into the admin, though. But I can’t access the site at all.

There is no /cache/ directory in the /wp-content/ folder. There is, however, a wp-cache-config.php file.

I deleted the video stuff but still get the message.

I deactivated the plugin. Still doesn’t work. I don’t think it is the plug-in, though, since it worked the night before.

Any ideas as to what is going on here? This site is not an important one and if any of my sites just had to have this issue, I’m glad it is this one. If there is something I need to fix, I can figure it out now and prevent it from happening to another.

Much thanks.

–PaulaO