See code generated by the template in XxDefinitions.cs lines 40-43
// IMPORTANT! Due to shortcoming in Visual Studio template the below cannot be automatically replaced with proper unique GUIDs, so you will have to do it yourself
internal static Guid XxWorkSpaceToolbarPluginId = new Guid("22222222-2222-2222-2222-222222222222");
internal static Guid XxViewItemToolbarPluginId = new Guid("33333333-3333-3333-3333-333333333333");
internal static Guid XxToolsOptionDialogPluginId = new Guid("44444444-4444-4444-4444-444444444444");
Please correct the lines according to the comment!