FBX problem

Hi everyone, i was working on this project using low poly versions of these wood pieces, but when i try to use them in Unreal it pops out an error about tangent space and smoothing groups, and as you can see in the images it comes like that. The thing is, I was using those fbx just fine but suddendly this error came out, I tried pretty much every solution on the web i found but still nothing changes. Any idea?