Ground Texture Doesn't work

Hi all, I am trying to build a ground plan with a road texture. I would like also update this texture at runtime during the simulation (I don't know if it is possible and is actually an other problem). I followed 1 "tutorial": http://answers.gazebosim.org/question/4761/how-to-build-a-world-with-real-image-as-ground-plane/ and then a second to correct a possible error: http://answers.gazebosim.org/question/7922/ground-plane-texture-image/ But for me doesn't work anymore. I have no error but I see a yellow and gray plane that is not what i want. I organized the files as described in the tutorials. The files that I have are: model.sdf true0 0 1100 10010050false0 0 110 10 model.config: My Ground Plane 1.0 model.sdf My textured ground plane. my_ground_plane.material material my_ground_plane/Image { technique { pass { ambient 1 1 1 1.000000 diffuse 1 1 1 1.000000 specular 0.03 0.03 0.03 1.000000 emissive 0.900000 0.900000 0.900000 1.000000 texture_unit { texture floor.png } } } } Can someone help me. I am really new in Gazebo and I don't know how to approach the problem. Thanks in advance