title: Venmo touch Braintree payment - compile error: Undefined symbols for architecture i386: "_OBJC_CLASS_$_VTClient"
body: <p>I have successfully installed braintree ios sdk using cocoapod and It was compiled fine.
  However, when I initVTClient in my appdelegate.m file. I was getting compiling error:</p>
  
  <pre><code>Undefined symbols for architecture i386:
  "OBJCCLASS_$_VTClient", referenced from:
  objc-class-ref in AppDelegate.o
  ld: symbol(s) not found for architecture i386
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>and I couldn't find any solutions online at all. any tips?</p>
  
  <p>also submitted an issue here:
  <a href="https://github.com/braintree/braintree_ios/issues/27" rel="nofollow">https://github.com/braintree/braintree_ios/issues/27</a></p>