Cannot export sky to a texture, no valid Sky is setup (Also make sure the game view has been rendered at least once).
UnityEditor.Rendering.HighDefinition.HDRenderPipelineMenuItems:ExportSkyToImage () (at ./Library/PackageCache/com.unity.render-pipelines.high-definition@e2f986726232/Editor/RenderPipeline/HDRenderPipelineMenuItems.cs:60)