Grunt Warning: Task "default" Not Found - gruntjs

Question

I am experimenting with Grunt and I am getting a Warning: Task "default" not found error when I try to run Grunt. my Gruntfile.js is
module.exports = function(grunt) {
grunt.initConfig({
concat: {
js: {
options: {
separator: ';'
},
src: [
'library/js/*.js'
],
dest: 'library/js/scripts.min.js'
},
},
uglify: {
options: {
mangle: false
},
js: {
files: {
'library/js/scripts.min.js': ['library/js/scripts.min.js']
}
}
},
less: {
style: {
files: {
"library/css/style.css": "library/less/style.less"
},
}
},
watch: {
js: {
files: ['library/js/*.js'],
tasks: ['concat:js', 'uglify:js'],
options: {
livereload: 35729
}
},
css: {
files: ['library/less/*.less'],
tasks: ['less:style'],
options {
livereload: 35729
}
},
php : {
files : ['**/*.php'],
options : {
livereload : 35729
}
}
}
});
grunt.loadNpmTasks('grunt-contrib-concat');
grunt.loadNpmTasks('grunt-contrib-uglify');
grunt.loadNpmTasks('grunt-contrib-less');
grunt.loadNpmTasks('grunt-contrib-watch');
grunt.registerTask('default', ['watch']);
};
This was working until I added the Livereload portions, and I think it might be a syntax error. However this is the first time I have used this and I simply don't know what is causing the problem. Any help would be greatly appreciated.

Answer 1

You're missing a colon for watch.css.options. Update to:
css: {
files: ['library/less/*.less'],
tasks: ['less:style'],
options: {
livereload: 35729
}
}

Answer 2

In case anyone finds this later to get livereload to work I had to change the watch section to
watch: {
js: {
files: ['library/js/*.js'],
tasks: ['concat:js', 'uglify:js'],
},
css: {
files: ['library/less/*.less'],
tasks: ['less:style'],
},
php : {
files: ['**/*.php'],
},
options: {
livereload: true,
spawn: false
}
}