Laravel 5.2 Zizaco/entrust 无法生存数据库

Laravel Framework version 5.2.31 按照Github上的说明，一步步配置的，到执行php artisan migrate 时会报错：

[Illuminate\Database\QueryException]                                         
  SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table nam  
  e '' (SQL: alter table `role_user` add constraint `role_user_user_id_foreig  
  n` foreign key (`user_id`) references `` (`id`) on delete cascade on update  
   cascade)
   
   
   [PDOException]                                                               
  SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table nam  
  e ''
  
  

查看数据库中的表，只创建了roles和role_user两个表！

回复内容：

Laravel Framework version 5.2.31 按照Github上的说明，一步步配置的，到执行php artisan migrate 时会报错：

[Illuminate\Database\QueryException]                                         
  SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table nam  
  e '' (SQL: alter table `role_user` add constraint `role_user_user_id_foreig  
  n` foreign key (`user_id`) references `` (`id`) on delete cascade on update  
   cascade)
   
   
   [PDOException]                                                               
  SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table nam  
  e ''
  
  

查看数据库中的表，只创建了roles和role_user两个表！

看这里