You should NOT delete code you know nothing about, as it casues the problems you are seeing now.
Can I ask why you deleted the code? If it was you only wanted the righthand side blocks to be on the fron page then you should delete the BLOCKS not the code! Add all the blocks you wan visible on the front page and make sure they are on the side that you want them to be. I am assuming on the right as normally Admin pages use the Left side only.
Another way it to force Frontpage to only use one side block. You do this by changing this line in the theme's config.php
// The site home page.
'frontpage' => array(
'file' => 'frontpage.php',
'regions' => array('side-post'),
'defaultregion' => 'side-post',