I help manage a Drupal 6 site and I know like nothing about Drupal so I foolishly upgraded to Drupal 7 or 8 (i don't even remember at this point) and ever since then, I get an error that says "Error The website encountered an unexpected error. Please try again later." when I publish blogs or pages but not when I save modules.
BUT the content does indeed publish. I have googled this error message but all the solutions I find either don't (at least I don't think) apply to me or I can't figure out how to do them because I don't know Drupal at all.