View insertion not works for me. Can you tell me whats wrong?

Hi, I use Custom Page with Drupal 6.12 and Views 2.6

After setup this module, I use this code:
<?php print custompage_region_tile('sidebar_left'); ?>

It works perfectly...

And then I add this code:
<?php print custompage_view_tile( $mypost, $title='The title', $display_id = 'block_1', $arg1, $arg2, $arg3); ?>

And this code give me nothing..

Im not sure about "$arg1, $arg2, $arg3"... removing it also not solving the problem

Can you tell me whats wrong in the codes?

Thanks in advance