CasperError: Casper is not started, can't execute `then()`

[andrepm06]

Hello,

I wrote the following in my grunfile.js:

phantomcss: {
            desktop: {
                options: {
                    screenshots: 'tests/visual-regression/screenshots/baseline',
                    results: 'tests/visual-regression/screenshots/results',
                    viewportSize: [1280, 1024]
                },
                src: ['test/visual-regression/**/*_spec.js']
            },

        mobile: {
            options: {
                screenshots: 'tests/visual-regression/screenshots/baseline',
                results: 'tests/visual-regression/screenshots/results',
                viewportSize: [320, 480]
            },
            src: ['test/visual-regression/**/*_spec.js']
        }
    }

grunt.loadNpmTasks('grunt-jasmine-node-new');

grunt.loadNpmTasks('grunt-phantomcss');

grunt.registerTask('test', ['phantomcss']);

};

But when i execute grunt test here what i got:

andre@testware:~/workspace/meu-psafe$ grunt test
Running "phantomcss:desktop" (phantomcss) task
CasperError: Casper is not started, can't execute `then()`                      
  /home/andre/workspace/meu-psafe/node_modules/grunt-    phantomcss/bower_components/phantomcss/CasperJs/modules/casper.js:396 in checkStarted
  /home/andre/workspace/meu-psafe/node_modules/grunt-        phantomcss/bower_components/phantomcss/CasperJs/modules/casper.js:1685 in then
  /home/andre/workspace/meu-psafe/node_modules/grunt-phantomcss/phantomjs/runner.js:58
    Warning:  Use --force to continue.

Aborted due to warnings.