I made a test to delete the imported course but it still show in my list. when I open the file, Chrome says not found.How can I remove them completely 
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Something like this? https://forum.lingq.com/t/is-there-a-way-we-can-eliminate-these-ghosts-empty-courses/158758
We are looking into this. Thanks for reporting.
Yes, there should be a lot of person with this problem.I have no idea now 
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Thank you for your reply