rviz不能显示模型

在学习http://wiki.ros.org/urdf/Tutorials/Building%20a%20Visual%20Robot%20Model%20with%20URDF%20from%20Scratch中新建模型的例子,但是每次启动后都报错:
Warning, Sum of Photometric type-related color channels and ExtraSamples doesn’t match SamplesPerPixel. Defining non-color channels as ExtraSamples…
然后,rviz中不能显示模型。

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