ProjectPointToNavigation

Hi,
I’m new to UE4 and I’m trying to learn how to use navmesh.
I made first simple project with just flor, navmesh bound volume and some actor that will spawn ai characters. I want to spawn AI Character on the navmesh.
I made BP like this:

https://forums.unrealengine.com/filedata/fetch?filedataid=145647&type=thumb

scene looks like that:

https://forums.unrealengine.com/filedata/fetch?filedataid=145648&type=thumb

get actor location return valid position but ProjectPointToNavigation return value of 0,0,0 , even if i set Query extent to something like 5000 .
please help.