Forgot to add the static modifier

Author: heku

Kool.EditProject.Shared/Commands/EditProjectCommand.cs

@@ -13,14 +13,14 @@ internal sealed class EditProjectCommand : BaseCommand
 
     private EditProjectCommand() : base(Ids.EDIT_PROJECT_MENU_COMMAND_ID)
     {
-        var result = Package.Instance.Selection.GetCmdUIContextCookie(Guid.Parse(Ids.EDIT_PROJECT_UI_CONTEXT), out _uiContextCookie);
+        var result = Package.Selection.GetCmdUIContextCookie(Guid.Parse(Ids.EDIT_PROJECT_UI_CONTEXT), out _uiContextCookie);
         ErrorHandler.ThrowOnFailure(result);
     }
 
     // After package loaded, the VisibilityConstraints way doesn't work anymore, we need to check it ourselves.
     private bool IsUIContextActive()
     {
-        var result = Package.Instance.Selection.IsCmdUIContextActive(_uiContextCookie, out var isActive);
+        var result = Package.Selection.IsCmdUIContextActive(_uiContextCookie, out var isActive);
         ErrorHandler.ThrowOnFailure(result);
         return isActive == 1;
     }

Kool.EditProject.Shared/Package.cs

@@ -34,7 +34,7 @@ public sealed partial class Package : AsyncPackage
     internal const string URL = "https://github.com/heku/kool.editproject";
 
     internal static DTE2 IDE { get; private set; }
-    internal IVsMonitorSelection Selection { get; private set; }
+    internal static IVsMonitorSelection Selection { get; private set; }
     internal static Options Options { get; private set; }
     internal static Package Instance { get; private set; }