This error comes because you have not imported the calling object. Please import everyting from class and try
 Ex: from MyClass import *

 This error may occur while creating a new project. The following can be any of the reason for this
 
  1. Check django installed properly, and check the folder site-packages in python installed folder.
  2. There can be issue with setting the PATH to the django folder and this can be solved by giving the full path
       Ex: /usr/lib/python2.7/site-packages/django/bin/django-admin.py startproject mysite
  3. This script should not execute from the python console. Go to the directory where you want to save the project then execute the command django-admin.py startproject mysite

emulator -avd -http-proxy http://LOCAL:8888

 You need to add http-proxy option to track the request in Charles Proxy

   I hope it happens when there is delay in the HTTP response.  We can suppress it using the error_reporting functionalists.

  var group = document.getElementsByName('groups[]');
 var groupError    =    true;
   
    for(var g = 0; g < group.length; g++)
    {
        if(group[g].checked == true)
            groupError    =    false;
    }
document.write(groupError);