Freetype Code Signing Error (Xcode 7.1) App Upload Issue
The error suggests a subcomponent is not signed. Use the --deep flag with codesign:


  --deep
  
  When signing a bundle, specifies that nested code content such as helpers, frameworks, and
  plug-ins, should be recursively signed in turn. Beware that all signing options you specify
  will apply, in turn, to such nested content.
  When verifying a bundle, specifies that any nested code content will be recursively verified as
  to its full content. By default, verification of nested content is limited to a shallow inves-tigation investigation
  tigation that may not detect changes to the nested code.
  When displaying a signature, specifies that a list of directly nested code should be written to
  the display output. This lists only code directly nested within the subject; anything nested
  indirectly will require recursive application of the codesign command.


Apple's Technical Note 2206: OS X Code Signing in Depth provides more insight.