pm2-deploy: Cannot clone the repo via pm2 deploy

I can git clone my repo in the server ssh terminal. However, when I use pm2 deploy ecosystem.json dev setup to setup my project, it shows the following message.

Initialized empty Git repository in /home/imfoyo/deploy/shb0577/development/source/.git/
Permission denied (publickey).
fatal: The remote end hung up unexpectedly

  failed to clone

Deploy failed

My ecosystem.json file is as follows:

{
  /**
   * This is a sample configuration file for PM2
   */

  /**
   * Here we declare the apps that must be managed by PM2
   * All options are listed here:
   * https://github.com/Unitech/PM2/blob/master/ADVANCED_README.md#json-app-declaration
   *
   */
  apps : [

    // First application
    {
      name      : "myrepo",
      script    : "bin/www",
      env: {
        COMMON_VARIABLE: "true"
      },
      env_production : {
        NODE_ENV: "production"
      }
    }

  ],


  /**
   * PM2 help you to deploy apps over your servers
   * For more help go to :
   * https://github.com/Unitech/PM2/blob/master/ADVANCED_README.md#deployment-pm2--090
   */
  deploy : {
    production : {
      user : "imfoyo",
      host : "192.168.199.174",
      ref  : "origin/master",
      repo : "git@bitbucket.org:belife/myrepo.git",
      path : "/var/www/production",
      "post-deploy" : "pm2 startOrRestart ecosystem.json --env production"
    },
    dev : {
      key  : "/home/imfoyo/.ssh/imfoyo.lan",
      user : "imfoyo",
      host : "192.168.199.174",
      ref  : "origin/master",
      repo : "git@bitbucket.org:belife/myrepo.git",
      path : "/home/imfoyo/deploy/development",
      "post-deploy" : "npm install && pm2 startOrRestart ecosystem.json --env dev",
      env  : {
        NODE_ENV: "dev"
      }
    }
  }
}