Using the Default Namespace in Organizations with No Namespace Set

If your organization hasn’t set a namespace prefix, use the default namespace c when referencing Lightning components that you’ve created.
The following items must use the c namespace when your organization doesn’t have a namespace prefix set.
  • References to components that you’ve created
  • References to events that you’ve defined
The following items use an implicit namespace for your organization and don’t require you to specify a namespace.
  • References to custom objects
  • References to custom fields on standard and custom objects
  • References to Apex controllers

See Namespace Usage Examples and Reference for examples of all of the preceding items.