problems with navmesh pathfinding

[SpaghettiCoding]

Hi guys! I make rpg game and try to implement pathfinding by using navmesh plugin
(https://github.com/mikewesthad/navmesh/blob/master/tiled-navmesh-guide.md)

there is a nice tutorial and i follow it
but i have problem, no matter what coordinates i pass it always return null
(i build navmesh in Tiled)

there is a code:

        const objectLayer = this.tilemap.getObjectLayer("navmesh");

        console.log(objectLayer);

        const navMesh = this.navMeshPlugin.buildMeshFromTiled("mesh", objectLayer, 5);

        console.log(navMesh);

        const path = navMesh.findPath({ x:1500, y: 2500 }, { x: 1600, y: 2600 });

        console.log(path);

that what i have in console:

 i tried to pass different coordinates and find path to mouse click. it always return null.   

if i add methods for visially debugging navmesh plugin it game looks like:

 

Has anyone encountered similar problems?
This plugin has clear tutorial and i'm soo confusing that it doest'n work for me.

I appreciate any guess.