Assuming your internet is up, the most likely cause of errors like this is corrupt/broken temporary files. To fix this, follow the steps related to your chosen browser.
Google Chrome
Log out of encore.
Click on the lock symbol next to the encore website.
Click on Cookies.
Click Remove and Done.
Log in to encore.
Microsoft Edge
Log out of encore.
Click the lock symbol by the encore website URL.
Click on Cookies.
Click Remove then Done.
Log back in to encore.
Firefox
Log out of encore.
Click the lock symbol next to the encore website URL.
