Tree prefab at index 0 is missing. Please Help!

Hello, Really hoping someone can help. I'm having a build error where a tree prefab is missing: ---- Tree prefab at index 0 is missing. UnityEditor.BuildPlayerWindow:BuildPlayerAndRun () Tree prefab at index 1 is missing. UnityEditor.BuildPlayerWindow:BuildPlayerAndRun () Tree prefab at index 2 is missing. UnityEditor.BuildPlayerWindow:BuildPlayerAndRun () Tree prefab at index 3 is missing. UnityEditor.BuildPlayerWindow:BuildPlayerAndRun () Build completed with a result of 'Failed' in 24 seconds (24098 ms) UnityEditor.BuildPlayerWindow:BuildPlayerAndRun () (at /Users/bokken/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:123) UnityEditor.BuildPlayerWindow+BuildMethodException: 10 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002be] in /Users/bokken/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:190 at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in /Users/bokken/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:95 UnityEditor.BuildPlayerWindow:BuildPlayerAndRun () (at /Users/bokken/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:123) ---- This has happened to me again recently and I had to start a whole new project because I couldn't build. They game will Play but not build. There are no missing trees in the terrain trees inspector and I even tried deleting all the trees from the scene and from the tree palette and tried deleting the whole terrain itself and even the tree prefabs and I still get the error. I only have 1 terrain and have only created 1 terrain. I even tried deleting the Library/Cache folder.... Running 2020.3.26f1 in HDRP. So frustrating. Does anyone have an idea? Thank you!