I’m also getting errors. In my case it is this:
/public_html/wp-content/plugins/w3-total-cache/.php): failed to open stream: No such file or directory
So it seems it is looking for .php in the w3-total-cache plugin directory. And just to be sure, there is no .php file in the plugin directory… as I fully expected.
There was no WP-touch install on this site. Like others, it killed wp-admin to a white screen and same with website. I had to rename the W3 plugin directory and a couple or few other files in the wp-content folder to clean up errors.