Landscape, tiles bugging?

Hi, i got a bug while i try to paint the landscape.

Here’s a screenshoot to details my bug, i can’t explain this properly sry for that.

So after some research, my bug is the shader materials who won’t compile.

another person with same problems :
( Landscape material shaders not compiling - Rendering - Unreal Engine Forums )

I don’t understand this :
SamplerSource for your all your TextureSample nodes to “Shared: Wrap”

Where can i find this ?