yii\web\Request::cookieValidationKey must be configured with a secret key.

我的yii2模板是：yii-basic-app-2.0.10.tgz，解压到当前文件夹进行使用；

运行时出现如下错误：

Invalid Configuration – yii\base\InvalidConfigException

yii\web\Request::cookieValidationKey must be configured with a secret key.

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解决方法：

打开文件config\web.PHP, 设置 'cookieValidationKey' => 'true',即可，如;
$config = [
    'id' => 'basic',
    'basePath' => dirname(__DIR__),
    'bootstrap' => ['log'],
    'components' => [
        'request' => [
            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
            'cookieValidationKey' => 'true',     //  就是这里了
        ],
        'cache' => [
            'class' => 'yii\caching\FileCache',
        ],