cant move on
I have done the 'people' unit about 5 times and it wont let me move on
There should be 9 lessons, so here is the bug.
Try to access to the 5 missing lessons through www.duolingo.com/skill/en/Places/X, replacing "X" by 5, 6, 7, 8 and 9.
You could create a new discussion in this same forum with an explicit title (like "Lessons 5 to 9 of Skill Places missing in my Tree") to catch Duo staff's attention on this bug or write to them directly with this title and screenshot of your tree and details (like which course it is ;)).