error when calling to_database method

[maxlibin]

$csvClass = new CSV; $csvClass = CSV::from_file('public/uploads/'.$filename); $csvClass->to_database('csv', $table_already_exists = false, $clear_existing_records = false);

SQLSTATE[42000]: Syntax error or access violation: 1166 Incorrect column name ''

SQL: CREATE TABLE csv (VARCHAR(200) NOT NULL, VARCHAR(200) NOT NULL)

Bindings: array ( )

/Users/libin/Sites/laravel/laravel/database/connection.php on line 264 Stack Trace: #0 /Users/libin/Sites/laravel/laravel/database/connection.php(184): Laravel\Database\Connection->execute('CREATE TABLE c...', Array) #1 /Users/libin/Sites/laravel/laravel/database/schema.php(115): Laravel\Database\Connection->query('CREATE TABLE c...') #2 /Users/libin/Sites/laravel/bundles/dbutil/libraries/dbutil.php(60): Laravel\Database\Schema::execute(Object(Laravel\Database\Schema\Table)) #3 /Users/libin/Sites/laravel/bundles/laravel-csv-master/libraries/csv.php(287): DBUtil::make('csv', Array) #4 /Users/libin/Sites/laravel/application/controllers/upload.php(32): CSV->to_database('csv', false, false) #5 [internal function]: Upload_Controller->post_index() #6 /Users/libin/Sites/laravel/laravel/routing/controller.php(325): call_user_func_array(Array, Array) #7 /Users/libin/Sites/laravel/laravel/routing/controller.php(285): Laravel\Routing\Controller->response('index', Array) #8 /Users/libin/Sites/laravel/laravel/routing/controller.php(165): Laravel\Routing\Controller->execute('index', Array) #9 /Users/libin/Sites/laravel/laravel/routing/route.php(153): Laravel\Routing\Controller::call('upload@(:1)', Array) #10 /Users/libin/Sites/laravel/laravel/routing/route.php(124): Laravel\Routing\Route->response() #11 /Users/libin/Sites/laravel/laravel/laravel.php(167): Laravel\Routing\Route->call() #12 /Users/libin/Sites/laravel/public/index.php(34): require('/Users/libin/Si...') #13 {main}