Unreal infite bulding

I’m having a problem with my Unreal (version 4.20). Whenever I ask him to start a building, he stops at 20% and never goes out of that position. My textures and particle do not load correctly, everything gets the default null texture.
Anyone know what’s going on?
I have a Threadripper 1950x a Vega FE and 32gb of ram

Thank you very much in advance