Get_mapped_doc error

I was trying to use the get_mapped and I am receiving an import error, not sure what I am missing:

from future import unicode_literals
import frappe
from frappe.model.document import Document
from frappe.model.mapper import get_mapped_doc

class fpaapplication(Document):
pass

@frappe.whitelist()
def make_advocate(source_name, target_doc=None):

    doc = get_mapped_doc("FPA Application", source_name, {
                    "FPA Application": {
                            "doctype": "Advocate",
                            "field_map": {
                                    "first_name": "first_name",
                            }}
            }, target_doc, set_missing_values)
    return doc

Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/load.py”, line 32, in getdoc
doc = frappe.get_doc(doctype, name)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 634, in get_doc
return frappe.model.document.get_doc(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 66, in get_doc
controller = get_controller(doctype)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 44, in get_controller
raise ImportError(doctype)
ImportError: FPA Application

Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 57, in application
response = frappe.handler.handle()
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 53, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 935, in call
return fn(*args, **newargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/load.py”, line 32, in getdoc
doc = frappe.get_doc(doctype, name)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 634, in get_doc
return frappe.model.document.get_doc(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 66, in get_doc
controller = get_controller(doctype)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 44, in get_controller
raise ImportError(doctype)
ImportError: FPA Application