General reference to a script entails:
most script errors are related to the specific browser you are using, which can generally be cleared up with general maintenance tasks like clearing browser cache, cookies, history, saved website data, etc.
Some browser extensions could also cause a script error to appear. So sometimes you would want to troubleshoot and audit the extensions enabled. In other cases you may need to re-install or update the browser which sometimes includes an update to the java version associated with it. Overall, script errors tend to be more specifically related to the computer or the software running on it and not the actual email platform. Please send me a PM if it is a return email from the server however so I can look into this issue for you.