I just received this error for the first time without having made any changes to my code.
Failed to collect dependencies at com.google.appengine.tools:appengine-gcs-client:jar:0.6 -> com.google.http-client:google-http-client:jar:[1.19.0,2.0): No versions available for com.google.http-client:google-http-client:jar:[1.19.0,2.0) within specified range -> [Help 1]