Angular Resource error in console - angularjs

Question

I ve got an angular resource service which then returns the data to a controller and I get all the data plus the data by name.
My application works just fine in the browser but I get a resource error in the console. Bad resource configuration.
I had a look in various questions and everyone states that I need to set the configuration property isArray to either false or true.
I have tried to do this but I still get an error.
Any ideas much appreciated.
Here is my service :
(function() {
var app = angular.module('test');
app.service('ContactResource', function($resource) {
return $resource('/contacts/:firstname', {},
{'update': {method: 'PUT'}},
{'query': { method: 'GET', isArray: true }},
{'get': { method: 'GET', isArray: false }}
);
});
}());
And here is my controller:
(function() {
var app = angular.module('test');
app.controller('contactsCtrl', function($scope, $routeParams, ContactResource) {
$scope.contacts = ContactResource.query();
$scope.singlecontact = ContactResource.get({firstname: $routeParams.firstname});
});
}());
The error I am getting is : Error: [$resource:badcfg] http://errors.angularjs.org/1.4.2/$resource/badcfg?p0=get&p1=object&p2=array&p3=GET&p4=%2Fcontacts
When I click it says :
Error in resource configuration for action get. Expected response to contain an object but got an array (Request: GET /contacts)
When I get the url is /contacts the response is :
[{EmailAddress:some#email.com, etc}]
When the url is /contacts/firstname the response is :
{EmailAddress:some#email.com,etc}

Answer 1

I solved the problem by adding a new controller called single controller and by separating the service into two functions. Here is how my code looks like now.
This is the service:
(function() {
var app = angular.module('test');
app.service('ContactResource', function($resource, $routeParams) {
this.all = function() {
return $resource('/contacts', {},
{'query': { method: 'GET', isArray: true }}
)};
this.single = function() {
return $resource('/contacts/:firstname', {firstname: '#firstname'},
{'query': { method: 'GET', isArray: false }}
);
}
});
}());
And the controllers :
(function() {
var app = angular.module('test');
app.controller('contactsCtrl', function($scope, $routeParams, ContactResource) {
$scope.contacts = ContactResource.all().query();
});
app.controller('singleCtrl', function($scope, $routeParams, ContactResource) {
$scope.singlecontact = ContactResource.single().query({firstname: $routeParams.firstname});
});
}());
For some reason which I am still not sure $resource wouldn't accept them into the same controller.