在生成discussion的表时，我的不管怎么弄，总是提示这个错误：
Argument 1 passed to Illuminate\Database\Grammar::parameterize() must be of the type array, string given, called in E:\xampp\htdocs\laravel51\vendor\laravel\framework\src\Illuminate\Database\Q
uery\Grammars\Grammar.php on line 672 and defined in E:\xampp\htdocs\laravel51\vendor\laravel\framework\src\Illuminate\Database\Grammar.php on line 118
怎么解决？
