WebApi found multiple actions that match the request

Calling interface times wrong: WebApi found multiple actions that match the request, even if your route is unique and error-related.

I have configured the route, as follows

Let's see if your namespace using contains: using SYSTEM.WEB.MVC;

If there is, remove it, then quote: Using System.Web.Http;

This problem occurs because both the MVC and Webapi templates are installed, and you are using the route attribute in MVC.

The reason I came up with the problem was that.

WebApi found multiple actions that match the request