If you get this message, try clearing your cache or browsing history to resolve it. 

• On Google Chrome you do this by clicking the 3 little vertical dots on the top right of the screen (next to the address bar), then choosing History > History >Clear browsing data > Select time frame> Clear data.  Close all open browsers and start again.
• On Chrome you can also go incognito which has the same effect – to do so click on the 3 little dots at the top right of the browser and choose New Incognito Window and start again. This can save having to reset your browsing favourites/passwords and so on.

• On Internet Explorer you do this by clicking on the cog icon top right of screen > Internet options > Browsing history > Delete browsing history> (Temporary Internet files and website files/cookies & website data/history) > Delete > OK.  Close down open browsers and start afresh.

• On Microsoft Edge you do this by clicking the 3 little horizontal dots on the top right of the screen (next to the address bar), then choose Settings> Privacy, search, and services> then scroll down to the section Clear Browser Data and select Choose what to clear>Clear now. Close all browsers and start again.

This is worth trying with any problem that crops up while accessing electronic resources, as it can resolve many issues where a page repeatedly fails to load.