Laravel 4:致命错误:在autoload.php中找不到类'Patchwork\Utf8\Bootup'

我添加"cviebrock /图像验证器":" 1.0*"到需要部分的composer.json.之后,我运行了作曲家更新,我收到了这个致命错误.

:::错误:::

Fatal error: Class 'Patchwork\Utf8\Bootup' not found in F:\xampp\htdocs\project\
bootstrap\autoload.php on line 46
Script php artisan clear-compiled handling the post-update-cmd event returned wi
th an error



  [RuntimeException]
  Error Output:



update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock]
 [--no-plugins] [--no-custom-installers] [--no-scripts] [--no-progress] [--with-
dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [packages1] ... [
packagesN]

::: ERROR :::

::: COMPOSER.JSON需要部分:::

"require": {
  "intervention/image": "2.*",
  "cviebrock/image-validator": "1.0.*"
},

我需要帮助来纠正这个致命的错误.

感谢和问候,

迈克尔桑格马