Relational Databases doesn't load

I wanted to begin the Relational Databases course with the boylerplate but after many tries of loading the course, I’m still stucked on the last step. On your documentation you say that it should be a bigger issue. How can I fix it?

I am not sure why some people have this problem and some do not. In some cases retrying works right away and in others, you have to wait a while and try again.

Unfortunately that is all I know about it.