yii migrate 报错 [ 2.0 版本 ]

yii migrate --migrationPath=@vendor/filsh/yii2-oauth2-server/migrations

*** applying m140501_075311_add_oauth2_server
PHP Strict Warning 'yii\base\ErrorException' with message 'Declaration of m14050
1_075311_add_oauth2_server::primaryKey() should be compatible with yii\db\Migrat
ion::primaryKey($length = NULL)'

in D:\web\pp\tets\vendor\filsh\yii2-oauth2-server\migrations\m140501_075311_add_
oauth2_server.php:6