php - Databse migration throws error while seeding two timestamp columns laravel 5 -

i extended default migration include additional table fields user table.

i wanted have created_at , updated_at fields timestamps values.

here code

<?php   use illuminate\database\schema\blueprint;  use illuminate\database\migrations\migration;   class createuserstable extends migration {  /**  * run migrations.  *  * @return void  */ public function up() {     schema::create('users', function(blueprint $table)     {         $table->bigincrements('id');                     $table->biginteger('group_id');         $table->string('fname',255);         $table->string('lname',255);         $table->string('email',255)->unique();         $table->string('password', 60);         $table->boolean('active');         $table->string('gravtar',255)->nullable();         $table->remembertoken();         $table->timestamps('created_at');         $table->timestamps('updated_at');      }); }  /**  * reverse migrations.  *  * @return void  */ public function down() {     schema::drop('users'); }  } 

the obstacle using 2 timestamps columns not migrate tables , throws exception

[pdoexception] sqlstate[42s21]: column exists: 1060 duplicate column name 'created_at' 

see, have 1 column name created_at , exception make no sense. when drop 1 of timestamps field, table migrated.

i have no clue causing this?

timestamps() method adds both created_at , updated_at columns. method doesn't accept arguments.

http://laravel.com/api/5.0/illuminate/database/schema/blueprint.html#method_timestamps http://laravel.com/docs/5.0/schema