Exporting from Blender (Collada), Texture won't load in Gazebo

Hello! I am trying to import the model made and textured in Blender into the Gazebo, which works fine, except I'm having troubles exporting the texture somehow... here's the blend file: https://mega.nz/#!OtQVmKqa!UhZTc6RKAt1Ztxz38ubBLwyX4dbIbXbydkibN9wXONY and here's the texture: https://mega.nz/#!7hQznCpT!XpTc2kEFqkP6Inim0E1banWzIIZQn4qri3SAD7F00EU I'm exporting to Collada and I've tried different export settings - the object is either dark gray, or completely white I followed this tutorial https://www.youtube.com/watch?v=LcCQKuWPhXk when making textures... when I export it to collada and specify texture options (when exporting) as 'Materials' and copy, the result is a dark gray wall, using 'UV Textures' instead of 'Materials' makes the wall white I've never really worked with Blender nor Gazebo before, so I'm not sure where is the problem