The plugin we are concerned with is w3 Total Cache.Since

The plugin we are concerned with is w3 Total Cache.Since there came out an article about this plugin in wpmudev I trusted and installed it.
To my sad surprise, at the very moment I activated this plugin (just by itself, alone)I got an "error" message, and I cannot get through to any of my admins; I cannot get through to the site.
Please help.
Best Regards!
David R