all modules now register and unregister without errors.

development_icon_get.py

@@ -248,8 +248,8 @@ def unregister():
         pass
     if __name__ == "__main__":
         # unregistering is only done automatically when run as add-on
-        bpy.types.unregister(OBJECT_PT_icons)
-        bpy.types.unregister(CONSOLE_HT_icons)
+        bpy.utils.unregister_class(OBJECT_PT_icons)
+        bpy.utils.unregister_class(CONSOLE_HT_icons)
 
     bpy.utils.unregister_module(__name__)
 

rigify/metarig_menu.py

@@ -54,6 +54,5 @@ def register():
 def unregister():
     bpy.utils.unregister_class(AddHuman)
 
-    #bpy.types.unregister(AddHuman)
     bpy.types.INFO_MT_armature_add.remove(menu_func)
 

rigify/ui.py

@@ -242,7 +242,7 @@ def register():
 
 
 def unregister():
-    bpy.types.unregister(DATA_PT_rigify_buttons)
-    bpy.types.unregister(BONE_PT_rigify_buttons)
-    bpy.types.unregister(Generate)
-    bpy.types.unregister(Sample)
+    bpy.utils.unregister_class(DATA_PT_rigify_buttons)
+    bpy.utils.unregister_class(BONE_PT_rigify_buttons)
+    bpy.utils.unregister_class(Generate)
+    bpy.utils.unregister_class(Sample)

space_view3d_copy_attributes.py

@@ -765,7 +765,7 @@ def unregister():
             item.idname = 'pose.copy'
             break
     for menu in _layer_menus:
-        bpy.types.unregister(menu)
+        bpy.utils.unregister_class(menu)
     bpy.types.DATA_PT_texface.remove(_add_tface_buttons)
     km = bpy.context.window_manager.keyconfigs.active.keymaps['Mesh']
     for kmi in km.items: