Problem using hatch

I’m having an issue using the Hatch command. Sometimes it works as expected, sometimes not. In this file hatch-issue.3dm (563.6 KB) There is a closed path in red on the left. When I select that and give the hatch command, it says it is creating graph and then nothing happens and I get no error message. How can I debug this problem? Two other areas, one half of the tree and another section of grass to the right of the red boundary worked.

your curve is open there:

okay, thanks. I missed that.