Why my Textures disappear?..

[1]Hey guys. I’m started UE4 just 1 month ago. I want you Master’s help.

When I drag my actor to Viewport, my actor’s Texture suddenly GONE.

:arrow_down::arrow_down: This is first my content browser. Texture seems good
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:arrow_down::arrow_down: And if I drag into the viewport, suddenly my textures gone.
PLZ help me. I’m using macOS, I already changed lot of version’s of UE4 and every version has same problem.
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What should I do now? :frowning: