I mark the trees to chopping trees but my colonists don't do it. I tried different ways but it didn't work. How can I fix that bug?
I do not think it is a bug. Do your colonist have time and priority and ability to chop wood? Check your work orders.
And another one who didn't read stickies of a forum.
Choping tree's is a plant cut worktype.
Did you assign someone to do that job ?
And if you still think it is a bug, read the sticky and provide some useful informations like at the sticky described.