Hello, I am sorry you are having access problems.
There are a number of things you can try if you are having trouble loading, viewing, or submitting exercises.
Reload the web page. This takes care of a majority of problems.
Make sure you are using one of these browsers: chrome, Firefox, Safari, and ie 10/11
Check your Internet connection. We recommend that you have a reasonably fast connection to the internet. Any broadband connection, like DSL or cable, should be sufficient.
Still having issues? Please go through our troubleshooting page or post on our forums.
Unfortunately, sometimes a few of our courses are very popular at certain times of the day and because of the traffic, can cause errors like this. Are you able to work on another course in the meantime, or try to get access at a later time?
I know this is inconvenient and I do apologize. I will send this feedback to our team.