Actually when I open up the lesson in question it turns out that it’s fine now. However, when I tried to test if the import function works properly just now, this error message turns up after a while.
"Internal 500 servies error
An error has occurred while processing your request. Depending on the type of error, it may be automatically logged and reviewed by our team so please retry your request in a few minutes. If you are still getting this error message after a few minutes, please email us at support@lingq.com."