How to resolve "unable to locate play service dependency base version 9.4.0"

[Richard Gaskin]

When trying to compile an app for Android I get an error: "unable to 
locate play service dependency base version 9.4.0"

No further guidance is provided.

Clues?

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
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  Ambassador at FourthWorld.com                http://www.FourthWorld.com