How should I do when appear GRAPHQL_ERROR?

Hi Charlieliao, 

We'd love to have a greater understanding of the issue you're running into. Could you please submit a support request in our Help Center? Here's the link: http://khan.co/KA-support. 

Thank you for being a part of Khan Academy!

the same thing has happended to me 7 times now

#CodingPython

I suggest submitting a support request via the "Report a Problem" link in the upper right or with the link Fernando provided in a previous comment.

I also have this problem

Same thing happens to me too often 

It sounds like this happens to at least 5 users.  Have any of you gotten useful information after submitting a support request?