try to create multi-files Add-on, install fail with Error: module 'bpy' has no attribute 'props' I have created an addon written in multiple files.

if "bpy" in locals():
    import importlib
    importlib.reload(operator_add)
else:
    from . import operator_add
    from . import operator_create


import bpy
import bmesh
import os
from operator_add import OBJECT_add


I got error message when trying to activate the add-on

AttributeError: module 'bpy' has no attribute 'props'

in the operator_add.py I have the class as follow:

class OBJECT_add(bpy.types.Operator):
    bl_idname = "myops.addthings"
    bl_label = "Add Base Mesh"
    bl_options = {'REGISTER', 'UNDO'}
    bl_description ="Add Base Mesh"
    #the error comes from this line:
    objectsToAdd = bpy.props.StringProperty()
    #this is trying to get the property from the UI draw() in the __init__.py

    def execute(self, context):
        add_myobject(self, context)
        return {'FINISHED'}
https://github.com/JacquesLucke/code_autocomplete

Here is a blender add-on that lets you create multi-file add-ons in blender easily. Just download the repository .zip and install the add-on. Next enable it. Now in the text editor click view &gt; properties You will now see a couple new panels one named Addon Development then you will see a text box. Simply type in the name of your new add-on and click the button that pops up that says new addon multi-file Once this is done it will create a multi-file add-on automatically for you. Remember to click save all filesoften and also when you load blender back up and want to work on your add-on again just click the eyedrop tool and you will see a list of all the add-ons you are currently working on and click the one to load and it will. Hope this helps :) 

Also in operator_add.py do you have import bpy? Maybe thats the reason?