C # reads the App. Config Profile node key value and prompts the solution to "Configure system failed to initialize" error

Create a new C # project, add the appsettings key in App. Config, and run with the error "configuration system failed to initialize", MSDN writes that if the configuration file contains configsections elements, the configsections element must be The first child element of a configuration element. ", it is normal to put the appsettings you added to configsections.

C # reads the App. Config Profile node key value and prompts the solution to "Configure system failed to initialize" error