**System Information**
Operating system and graphics card
OS: Windows 8.1
GPU: GTX 970
**Blender Version**
Broken: 2.72a 73f5a41
Worked: 2.71
**Short description of error**
Drop to Ground add-on can not be added in Blender 2.72a
**Exact steps for others to reproduce the error**
Install object_drop_to_ground.py into the add-on folder
Go to user preferences -> Add ons
Select Object: Drop to Ground and check it
Returned error: AttributeError: 'RNA_Types' object has no attribute 'VIEW3D_PT_tools_objectmode'