Afaf Mg on "Internal Server Error"

Hi

My website shows internal server error. I don not know why. I was working in the editor when I click update, this happened.

Can the w3 total cache be the reason ?
Because before this problem, when I updated the editor many times I didn't see any changes in the website.Then I deactivated the plugin and the changes appeaes. But when this problem happened, the plugin was active.