Try to delete YourProjectName_PCD3D_SM6.upipelinecache in your saved folder (appdata/local/ YourProjectName/saved/)
And add in your defaultengine.ini :
[/Script/Engine.RendererSettings]
r.ShaderPipelineCache.Enabled=0
It’s a temporal solution because PSO is now removed. Can decrease performance depending of your project. So keep in mind it’s a quick fix to remove later when it will be fixed