can't run simple script

I keep getting this error.

Blender Game Engine Started
Python controller found the module but could not access the function - object ‘Cube’, controller ‘Python’:
AttributeError: ‘module’ object has no attribute ‘garrett’
Blender Game Engine Finished

here is the script

import bge

def garrett(cont):
    own = cont.owner

.blend file

You can’t use Python module names for your module name, change to somthing else or add a namespace.

This is the conflicting module: