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java.lang.NullPointerException: No authentication header information	at com.google.gdata.util.AuthenticationException.initFromAuthHeader(AuthenticationException.java:96)	at com.google.gdata.util.AuthenticationException.(AuthenticationException.java:67)	at com.google.gdata.client.http.HttpGDataRequest.handleErrorResponse(HttpGDataRequest.java:608)	at com.google.gdata.client.http.GoogleGDataRequest.handleErrorResponse(GoogleGDataRequest.java:564)	at com.google.gdata.client.http.HttpGDataRequest.checkResponse(HttpGDataRequest.java:560)	at com.google.gdata.client.http.HttpGDataRequest.execute(HttpGDataRequest.java:538)	at com.google.gdata.client.http.GoogleGDataRequest.execute(GoogleGDataRequest.java:536)	at com.google.gdata.client.Service.getFeed(Service.java:1135)	at com.google.gdata.client.Service.getFeed(Service.java:1077)	at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:676)	at com.google.gdata.client.Service.getFeed(Service.java:1034)	at com.cohere.getcontacts.GoogleContactsAccess.printAllContacts(GoogleContactsAccess.java:59)	at com.cohere.getcontacts.GoogleContactsAccess.main(GoogleContactsAccess.java:197)