Azure Web应用程序——多个应用程序托管访问Web API，但它显示了Web的错误。Web应用程序的配置

I am not sure if this has been asked before. I am trying to deploy my two web applications to an azure web app, an asp.net web form application and an asp.net web api. I do know that I can create two different directories and then put my two applications to those two directories. However when I do that and configure like the first image below, my web app works well but my web API get a problem, an error from the web.config file of the web application is shown. I've tried to disable my web application then the web API worked well after that.I am not sure if this has been asked before. I