PHPHub5 安装时数据库命令执行报错~~~~求助

执行数据库命令

php artisan migrate

的时候报错，信息如下

                                                                                                                                                                                                                   
  [Illuminate\Database\QueryException]                                                                                                                                                                                         
  SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes (SQL: alter table `oauth_client_endpoints` add unique `oauth_client_endpoints_client_id_redirect_uri_unique  
  `(`client_id`, `redirect_uri`))                                      

[PDOException]                                                                                                   
  SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes  

求助此问题解决方案~~~