We could not find any lessons showing in every category

A couple of minutes ago everything was fine. I imported a lesson in portuguese and started lingqing. Suddenly I got a syntax json error so I refreshed the page. And the lesson was gone.

And any other lesson too. I logged out but the same message shows: no lessons found. I tried with Russian, with the same result… (Using silk browser on my kindle)

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Can you please let me know if you still have the same problem?