Invalid Position!

Link to the issue on Reddit

https://www.reddit.com/r/StardewValley/comments/56g82c/why_is_this_an_invalid_position_for_a_tree/

Brief breakdown is that the game will not allow you to place trees and several other objects where you have removed bushes and large stumps

 

On the forest farm at least those spots appear to be forage spots.

 

You should probably post this in support. Unless I'm missing a suggestion somewhere in there?