Unknown error when installing URP in project.

I just installed URP in my existing project, which was using the built-in pipeline. I converted my materials to work with URP and in the graphics settings, I put in the URP pipeline. When playing my game, I keep on getting these two errors: Shader Unknown uses undefined Queue: ‘Opaque’ UnityEngine.Rendering.RenderPipelineManager:CleanupRenderPipeline() and Shader Unknown uses undefined Queue: ‘Opaque’
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
Does anyone know how to fix this, or where the problem is at?

I have the same problem. Please help!