No "angular_architecture_graph" targets found.

[Darex1991]

Hi,
I try to use this plugin, but when I included it into Gruntfile.js and executing it I got error:

grunt angular_architecture_graph
>> No "angular_architecture_graph" targets found.
Warning: Task "angular_architecture_graph" failed. Use --force to continue.

Aborted due to warnings.

my Gruntfile.js

grunt.loadNpmTasks('grunt-angular-architecture-graph');
  // Define the configuration for all the tasks
  grunt.initConfig({
    angularArchitectureGraph: {
      diagram: {
        files: {
          //'<%= yeoman.app %>/<%= yeoman.scripts %>': ['<%= yeoman.app %>/<%= yeoman.scripts %>/**/*.js']
          'architecture': ['<%= yeoman.app %>/<%= yeoman.scripts %>/**/*.js', "<%= projectConfig.app %>/<%= projectConfig.project %>/**/*.js"]
        }
      }
    },
.
.
.

What is wrong?