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Try these things:

1) Make sure the image type is correct:

$ identify <your_image.png>

The output should look like:

willowMap.png PNG 513x513 513x513+0+0 8-bit PseudoClass 256c 3.41KB 0.000u 0:00.000

2) The location of the willowMap.png that is used by gazebo is:

simulator_gazebo/gazebo/gazebo/share/gazebo/Media/materials/textures

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