There is a topic which already tells you how to get crowns, u can find it by searching it. it will be in this forum. mine is for the beginners who can't buy vaults and remove forests.
So i found that when u get crown, u always have to use Fruit tree so here is the way.
1. line up all fruit trees
2. line up all gold mines
3. turn on these two cheats. unlimited crowns/food/oil/gold & place multiple of same building
4. gather fruit trees and mine the golds. (don't ripen trees and prospect mines. make sure u follow this)
5. when No.4 is done, ripen every fruit trees and prospect gold mines fast as you can ------ so u need to do it fast.
6. u fill find it crowns go up and there s no error.
That's it!
someone maybe find this way prior to me, but i wanted to share this way so try it and feel free to ask me if u have a question. Good Luck!