Help me to unlock my next lesson on SQL bcz it not unlock. I Completed all the lessons from 1-18

Question

I Completed all the lessons from 1-18 but the next lesson 19 is not unlock
https://code.sololearn.com/W5lrbw944zcq/?ref=app

Answer 1

Clear cache.
Log out and log in again.. and see.
If not work then mailto : [e-mail]
Hope it helps..