php - Laraver routing error

I have weird route error in Laravel. Stucked fixing it. Here is my action (it is in simplified version).

public function ibf() {
    $existing_board_id = Input::get('existing_board_id');
    ...

    return Redirect::route('board.index')->with('success', 'Board is successfully imported.');
}
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Form, here $board is new Model, not saved one, but with pre-defined values.

 {{ Form::model($board, ['route' => 'board.ibf',  'method' => 'POST', 'class' => 'form-horizontal']) }}
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routes.php

Route::group(array('prefix' => 'board'), function() {
        Route::post('/ibf/', array(
        'as' => 'board.ibf',
        'uses' => '[email protected]'
    ));}
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Error:

protected function methodNotAllowed(array $others)
{
    throw new MethodNotAllowedHttpException($others);
}
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Everything looks simple, but I really dont understand the problem.