Just remove the file and W3TC will re-add it if needed.
I got this error on an upgrade just now -- and it was a W3TC file but apparently out of date enough that it wasn't detected as such.
Just remove the file and W3TC will re-add it if needed.
I got this error on an upgrade just now -- and it was a W3TC file but apparently out of date enough that it wasn't detected as such.