Why do I get this error "context must be a dict rather than Context." ?

My code : I am following tutorial on Django site and this is where I got stuck

"current_datetime"

I am not sure why I get the Type Error at line 20. Its same as tutorial. 

When I run the server, I get the following error : 

TypeError at /time/

context must be a dict rather than Context.

Request Method:	GET
Request URL:	http://127.0.0.1:8000/time/
Django Version:	1.11
Exception Type:	TypeError
Exception Value:	context must be a dict rather than Context.
Exception Location:	D:\Users\Pubudu\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\context.py in make_context, line 287
Python Executable:	D:\Users\Pubudu\AppData\Local\Programs\Python\Python36\python.exe
Python Version:	3.6.1
Python Path:	['C:\\Users\\Pubudu\\workspace\\hello', 'D:\\Users\\Pubudu\\AppData\\Local\\Programs\\Python\\Python36\\python36.zip', 'D:\\Users\\Pubudu\\AppData\\Local\\Programs\\Python\\Python36\\DLLs', 'D:\\Users\\Pubudu\\AppData\\Local\\Programs\\Python\\Python36\\lib', 'D:\\Users\\Pubudu\\AppData\\Local\\Programs\\Python\\Python36', 'D:\\Users\\Pubudu\\AppData\\Local\\Programs\\Python\\Python36\\lib\\site-packages']
Server time:	Sat, 29 Apr 2017 21:35:31 +0000

Traceback Switch to copy-and-paste view

• D:\Users\Pubudu\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\handlers\exception.py in inner

  41.             response = get_response(request)

      ...
  ▶ Local vars
• D:\Users\Pubudu\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\handlers\base.py in _get_response

  187.                 response = self.process_exception_by_middleware(e, request)

       ...
  ▶ Local vars
• D:\Users\Pubudu\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\handlers\base.py in _get_response

  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

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