How to delete lessons and courses?

I want to delete any lessons and courses, but it has a mistake and display these in the web page:

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

I try to delete them in Login - LingQ
but the lessons and courses still in my account.
So, how to delete lessons and courses?

At the moment there is an issue and lessons can’t be removed. Our team is looking into it, we will get it fixed soon.