Shader warning: requires texture sampler

I start to get this message when I run the game, not sure what caused it.
Any ideas?

Shader [Shader Id 20 shader] requires texture sampler [uDepthMap] which has not been set, while rendering [Pass:RenderAction 0-9 Cam: camera | camera | World | Untitled]

Please see: Lots of shader error messages after new update

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