NameError: name 'datetime' is not defined

ERPNext Customize ERPNext
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I am getting this error after adding a file to hook.py after that i have removed the code which was a after_login trigger. It would be a great help if anyone could solve this

Traceback (most recent call last):
  File "apps/frappe/frappe/app.py", line 55, in application
    init_request(request)
  File "apps/frappe/frappe/app.py", line 129, in init_request
    frappe.local.http_request = frappe.auth.HTTPRequest()
  File "apps/frappe/frappe/auth.py", line 34, in __init__
    self.set_session()
  File "apps/frappe/frappe/auth.py", line 70, in set_session
    frappe.local.login_manager = LoginManager()
  File "apps/frappe/frappe/auth.py", line 119, in __init__
    self.make_session(resume=True)
  File "apps/frappe/frappe/auth.py", line 207, in make_session
    frappe.local.session_obj = Session(
  File "apps/frappe/frappe/sessions.py", line 239, in __init__
    self.resume()
  File "apps/frappe/frappe/sessions.py", line 310, in resume
    data = self.get_session_record()
  File "apps/frappe/frappe/sessions.py", line 328, in get_session_record
    r = self.get_session_data()
  File "apps/frappe/frappe/sessions.py", line 344, in get_session_data
    data = self.get_session_data_from_db()
  File "apps/frappe/frappe/sessions.py", line 389, in get_session_data_from_db
    data = frappe._dict(frappe.safe_eval(rec and rec[0][1] or "{}"))
  File "apps/frappe/frappe/__init__.py", line 2298, in safe_eval
    return eval(code, eval_globals, eval_locals)
  File "<string>", line 1, in <module>
NameError: name 'datetime' is not defined