title: Assertion failure in -[UITextFieldLabel setTextColor:]
body: <p>i got following assertion failure :</p>
  
  <p><em><strong></em> Assertion failure in -[UITextFieldLabel setTextColor:], /SourceCache/UIKit_Sim/UIKit-1448.89/UILabel.m:314</strong></p>
  
  <p>at this line </p>
  
  <p><em><strong>[self.window makeKeyAndVisible];</em></strong></p>
  
  <p>in appDidFinishLaunching method.</p>
  
  <pre><code>    Unhandled exception: Debug info are
  
      Invalid parameter not satisfying: color
      (
  "4   libc++abi.dylib                     0x991331fe _Z19safe_handler_callerPFvvE + 15",
  "5   libc++abi.dylib                     0x99133268 __cxa_bad_typeid + 0",
  "6   libc++abi.dylib                     0x991342a0 _Z23__gxx_exception_cleanup19_Unwind_Reason_CodeP17_Unwind_Exception + 0",
  "7   libobjc.A.dylib                     0x0167e416 __objc_personality_v0 + 0",
  "8   CoreFoundation                      0x0182cef8 +[NSException raise:format:arguments:] + 136"
    )
  </code></pre>
  
  <p>Any help would be appreciated :)</p>
  
  <p>Thanks in advance.</p>