With the recent January 2017 Appery platform update, another issue was introduced with the Xcode export for iOS. I would get a "build failed" with an error pertaining to the CDVInAppBrowser.m file (located in your app folder Plugins cordova-plugin-inappbrowser).
I found there is a difference between the current export and some prior exports regarding the version of this CDVInAppBrowser.m file. I found replacing file with a more current version fixes the problem and now the app builds properly in Xcode.
Appery should address this issue so the proper version of the file is exported for the current version of Xcode.