title: How to make umbrella framework, sub-framework error
body: <p>How to make umbrella framework in xcode 8? I saw this 
  <a href="https://stackoverflow.com/questions/27484997/how-to-create-an-umbrella-framework-in-ios-sdk">How to create an umbrella framework in iOS SDK?</a> and <a href="https://stackoverflow.com/questions/34681435/how-to-add-a-framework-inside-another-framework-umbrella-framework/34837164#34837164">How to add a framework inside another framework (Umbrella Framework)</a>, but i cant make 'Umbrella framework'. 
  Unfortunately when adding the umbrella framework into another project I get various "undefined symbol" errors from the sub-frameworks. How to include sub-framework into umbrella, i want to add only umbrella in app, not sub-framework. Please someone help me with this.</p>