Laravel error upon submitting a form: MethodNotAllowedHttpException in RouteCollection.php line 218. What could this be due to?

There is a form in my view, from where, on clicking submit, data is taken to ajax script which is supposed to invoke the controllers specified in the post routes in routes.php. The controllers are expected to process the received data and throw the result back to the view. Why is this error occurring immediately after submitting the form and things aren't working as expected>

via Chebli Mohamed