missing js property

gruntfile

 // The wrapper function
module.exports = function(grunt) {

    var SRC_CSS   = 'app/css/';
    var SRC_CSS_ADMIN   = 'app/css/admin/';
    var SRC_CSS_LANDING   = 'app/css/landing/';
    var SRC_JS    = 'app/js/';
    var SRC_JS_ADMIN    = 'app/js/admin/';
    var SRC_JS_LANDING    = 'app/js/landing/';
    var BUILD_CSS = 'web/css/';
    var BUILD_JS  = 'web/js/';

  // Project and task configuration
	grunt.initConfig({
		concat: {
			options: {
				separator: "\n\n"
			},
			jsAdmin: {
				src: [
                    //Jquery
                    SRC_JS_ADMIN + 'components/jquery/jquery.js',
                    //Bootstrap
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-affix.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-alert.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-modal.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-button.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-collapse.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-dropdown.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-typeahead.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-tooltip.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-popover.js',
                    SRC_JS_ADMIN + 'components/bootstrap/js/bootstrap-transition.js',
                    //Select2
                    //SRC_JS_ADMIN + 'components/select2/select2.js',
                    //App
                    SRC_JS_ADMIN + 'app.js'
				],
				dest: BUILD_JS + 'main.js'
			},
            jsLanding: {
                src: [
                    //Jquery
                    SRC_JS_LANDING + 'jquery.js',
                    SRC_JS_LANDING + 'gMap.js',
                    SRC_JS_LANDING + 'page.js',
                    //App
                    SRC_JS_LANDING + 'app.js'
                ],
                dest: BUILD_JS + 'landing.js'
            },
            cssAdmin: {
                src: [
                    //Bootstrap
                    SRC_CSS_ADMIN + 'bootstrap/bootstrap.css',
                    SRC_CSS_ADMIN + 'bootstrap/bootstrap-responsive.css',
                    SRC_CSS_ADMIN + 'bootstrap/bootstrap-overrides.css',
                    //Vendors
                    SRC_CSS_ADMIN + 'lib/*.css',
                    //App
                    SRC_CSS_ADMIN + '*.css',
                    SRC_CSS_ADMIN + 'compiled/*.css'

                ],
                dest: BUILD_CSS + 'main.css'
            },
            cssLanding: {
                src: [
                    //Bootstrap
                    SRC_CSS_LANDING + 'bootstrap/bootstrap.css',
                    SRC_CSS_LANDING + 'bootstrap/bootstrap-responsive.css',
                    SRC_CSS_LANDING + 'landing.css'
                ],
                dest: BUILD_CSS + 'landing.css'
            }
		},
        "cssmin": {
            cssAdmin:{
                src: BUILD_CSS + 'main.css',
                dest: BUILD_CSS + 'main.min.css'
            },
            cssLanding:{
                src: BUILD_CSS + 'landing.css',
                dest: BUILD_CSS + 'landing.min.css'
            }
        },
		"closure-compiler": {
			admin: {
				closurePath: 'app/lib/closure-compiler',
				js: BUILD_JS + 'main.js',
				jsOutputFile: BUILD_JS + 'main.min.js',
				maxBuffer: 500,
				options: {
					compilation_level: 'SIMPLE_OPTIMIZATIONS',
					language_in: 'ECMASCRIPT5_STRICT'
				}
			},
            landing: {
                closurePath: 'app/lib/closure-compiler',
                js: BUILD_JS + 'landing.js',
                jsOutputFile: BUILD_JS + 'landing.min.js',
                maxBuffer: 500,
                options: {
                    compilation_level: 'SIMPLE_OPTIMIZATIONS',
                    language_in: 'ECMASCRIPT5_STRICT'
                }
            }
		},
		watch: {
			styles: {
				files: [SRC_CSS + '**/*.css'],
				tasks: ['concat'],
				options: {
					nospawn: true
				}
			},
			scripts: {
				files: [SRC_JS + '**/*.js'],
				tasks: ['concat'],
				options: {
					nospawn: true
				}
			}
		}
	});

	// Load plugins
	grunt.loadNpmTasks('grunt-contrib-watch');
	grunt.loadNpmTasks('grunt-contrib-concat');
	grunt.loadNpmTasks('grunt-closure-compiler');
    grunt.loadNpmTasks('grunt-css');

	// Define tasks
	grunt.registerTask('default', ['watch']);
	grunt.registerTask('build', ['closure-compiler', 'cssmin']);
};