Can´t export bump maps

Greetings, I recently discover blend4web and have taken greate intrest in it.
However every time I export a blender file into a html file and open it with the browser the bump map won´t work. Ofcourse I have looked on the forum about this but cant find anything that have helped so far. If anyone know how to fix this I would be more than happy.

Good day. Thank you for taking an interest in Blend4Web.
Could you please attach to one of your posts the blend file with a scene that doesn't work, so we can see what's wrong with it?

Here you go, also thanks for replying so quickly.
Let me know if there is anything else you want from me.

Let me know if there is anything else you want from me

Could you also send bump texture you're using? (other textures aren't necessary)

Here it is

It seems something is wrong with your texture. While we'll be fixing this problem you can export it to PNG format, it might help.

I tried changing the texture to PNG but with no effect.

Have you tried using simple material, without nodes, just with textures? (view attachment)