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Textures disappeared - I don't know why

Hi, im new in unreal, im learning so maybe my questions could be noob haha
sorry

I have this problem, I have imported some Assets into my scene, some trees, and it looked nice.
But when I built the scene later and played, the textures disappeared, and I can only see a gray color in the tree…
Please I don’t know what is causing this problem, I suppose that is some settings maybe.
Thanks
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Here is when is clicked on PLAY button…

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