Issues with prefabs

so I'm running 2019.4 LTS and have started having issues with my prefabs. WHen I click on some of them I'm getting the following error:

Code (CSharp):

1. TypeLoadException: Could not resolve type with token 01000099 (from typeref, class/assembly UnityEditor.AssetImporters.ScriptedImporter, UnityEditor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null) assembly:UnityEditor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null type:UnityEditor.AssetImporters.ScriptedImporter member:(null) signature:<none>
2. UnityEditor.UIElements.InspectorElement+<>c__DisplayClass58_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <af78ad00a40d4f61b82afc6cafb0a416>:0)
3. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Nothing has come up in any search results for this error. I've reimported my project twice and it still happens. Anyone else run into this and have a solution?