The cordova-HTTP plugin is using AFNetworking. Also the AppBuilder
LiveSync plugin (which is enabled by default in Debug build) is using it too. Currently you can build your project in Release
configuration and the problem will disappear.
The build issue appears because of the AFNetworking dependency is referenced in the cordova-HTTP plugin - this way the other plugins in the project cannot reference AFNetworking anymore. The correct way to reference AFNetworking is to add a dependency to the cordova-afnetworking plugin which is already done in the AppBuilder
Since this is only workaround but not a solution to your problem, we are working on the compatibility with the cordova-HTTP. The Telerik Platform
team will contact the authors of the cordova-HTTP and we'll suggest them to remove the static AFNetworking files and use the cordova-afnetworking plugin as dependency. This will solve the problem and any other plugins you add to your project which are depending on AFNetworking like AppBuilder
LiveSync plugin will not cause conflicts.