Local Npm module "grunt-contrib-watch" not found-error

[petetnt]

When user has already installed grunt-contrib-watch via npm before installing grunt-express, npm won't install it under grunt-express/node_modules (npm/npm#1341) which leads to the following:

> grunt express
>> Local Npm module "grunt-contrib-watch" not found. Is it installed?

However, other than the error, everything seems to work as normal.

Steps to repro:

Gruntfile:

module.exports = function (grunt) {
    grunt.initConfig({
        express: {
            test: {}
        }
    });
    grunt.loadNpmTasks("grunt-express");    
}

> npm install grunt-contrib-watch
> npm install grunt-express
> grunt express
>> Local Npm module "grunt-contrib-watch" not found. Is it installed?

[dongshaohan]

I had solved this problem.

grunt.loadNpmTasks('grunt-contrib-watch');
grunt.loadNpmTasks('grunt-express');

the watch plugin must be ahead.