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Your mistakes is here main_profile is mistake , profile type always start with profile_name . just need change main_profile to profile_main global $user;
$user->uid ; print_r($user->uid); print "print out the user value" . $user->uid;

$uid =3;

$account = user_load($user->uid); 

$profile = profile2_load_by_user($account);

$print_first_name = drupal_render(field_view_field('profile2',$profile['profile_main'], 'field_first_name')); print $print_first_name;

If you wnat see all your profile type and correct name print_r $profile

$profile = profile2_load_by_user($account);
print_r($profile);