How to solve "Caught std::invalid_argument: Attempt to set resource handler to an empty protocol method."

[TJUCoastlabRGQ]

I have installed resbed on a windows platform, and run the demo gave in the introduction part, however I got the following error,

C4996 'restbed::Http': HTTP client is deprecated; we will release a complimentary client framework at a future date.

I also tried to ignore this when the system compile this program, it can be compiled successfully, but when the following command excuted,

resource->set_method_handler("POST", simple_post_handler);

I got the following output,

Caught std::invalid_argument: Attempt to set resource handler to an empty protocol method.

What's the problem, and how to solve this.

[ben-crowhurst]

Please provide a complete example for further investigation.