title: Extension not getting installed through composer in cpanel
body: <p>I am using yii2 basic application template. I have VPS server for hosting my software. In my cpanel I have installed composer successfully. Then I uploaded my files from local machine to the server.</p>
  
  <p>Now I want to do composer update in cpanel using Putty. </p>
  
  <p>My composer is as below:</p>
  
  <pre><code>{
      "name": "yiisoft/yii2-app-basic",
      "description": "Yii 2 Basic Project Template",
      "keywords": ["yii2", "framework", "basic", "project template"],
      "homepage": "http://www.yiiframework.com/",
      "type": "project",
      "license": "BSD-3-Clause",
      "support": {
          "issues": "https://github.com/yiisoft/yii2/issues?state=open",
          "forum": "http://www.yiiframework.com/forum/",
          "wiki": "http://www.yiiframework.com/wiki/",
          "irc": "irc://irc.freenode.net/yii",
          "source": "https://github.com/yiisoft/yii2"
      },
      "minimum-stability": "stable",
      "require": {
          "php": "&gt;=5.4.0",
          "yiisoft/yii2": "&gt;=2.0.5",
          "yiisoft/yii2-bootstrap": "*",
          "yiisoft/yii2-swiftmailer": "*",
          "nex/yii2-datepicker": "*",
          "kartik-v/yii2-mpdf": "*",
          "wbraganca/yii2-dynamicform": "*",
      "yiisoft/yii2-jui": "@dev",
      "bupy7/yii2-dynamic-fields": "*",
      "unclead/yii2-multiple-input": "v2.9.0",
      "faryshta/yii2-disable-submit-buttons": "@dev",
      "phpoffice/phpexcel": "@dev",
      "mdmsoft/yii2-admin": "*"
  
      },
      "require-dev": {
          "codeception/codeception": "*",
          "yiisoft/yii2-debug": "*",
          "yiisoft/yii2-gii": "*",
          "yiisoft/yii2-faker": "*"
      },
      "config": {
          "process-timeout": 1800
      },
      "scripts": {
          "post-create-project-cmd": [
              "yii\\composer\\Installer::postCreateProject"
          ]
      },
      "extra": {
          "yii\\composer\\Installer::postCreateProject": {
              "setPermission": [
                  {
                      "runtime": "0777",
                      "web/assets": "0777",
                      "yii": "0755"
                  }
              ],
              "generateCookieValidationKey": [
                  "config/web.php"
              ]
          },
          "asset-installer-paths": {
              "npm-asset-library": "vendor/npm",
              "bower-asset-library": "vendor/bower"
          }
      }
  }
  </code></pre>
  
  <p>Everything is fine, when I type the command composer update, it shows the below error</p>
  
  <pre><code>[ifsoftware1234@216-10-245-56 basic]$ composer update
  Loading composer repositories with package information
  Updating dependencies (including require-dev)
  Your requirements could not be resolved to an installable set of packages.
  
    Problem 1
      - Installation request for nex/yii2-datepicker * -&gt; satisfiable by nex/yii2-datepicker[dev-master].
      - nex/yii2-datepicker dev-master requires bower-asset/eonasdan-bootstrap-datetimepicker 4.17.* -&gt; no matching package found.
  
  Potential causes:
   - A typo in the package name
   - The package is not available in a stable-enough version according to your minimum-stability setting
     see &lt;https://getcomposer.org/doc/04-schema.md#minimum-stability&gt; for more details.
   - It's a private package and you forgot to add a custom repository to find it
  
  Read &lt;https://getcomposer.org/doc/articles/troubleshooting.md&gt; for further common problems.
  </code></pre>