How to move forward or next level

Question

I completed my previous lesson it continuously telling me to complete previous lesson what to do please help

Answer 1

Check that you have done all the tasks and received a green tick.
If all else fails send an email to [e-mail]

Answer 2

Try update version. Or
Close app clear cache and reopen app and try then. If not work, take screen shots and and ask sololearn for the issue by mail to: [e-mail] Hope it helps..