jforinfo

if nothing has been touched maybe you can ask your host support. Maybe they re-configuring their server.

My problem is i use w3 total cache and I uncheck the “Enable dashboard widget” option and the problem is gone.

You can try to look for any “dashboard” option in your plugin and try to unchecking it.

Maybe it’s hosting configuration (I don’t know for sure) but on my other host there is no problem even I check the “Enable dashboard widget” option on total cache my wp still fine.

I forgot. Everytime you deactivate the plugin go to your dashboard and if the problem is still occured try to deactivate the next plugin and so on.. so you will know which plugin causing the error