proble qith xvid to svcd

[lucky luke15]

ok when i have some movies in Xvid codec and when i try to change it in TMPGEnc to svcd it says "invalid pointer operation" what do i do i saw a post in a form to "change the header"? what dose that mean... im still a bit of a newbie on this..any help would be great i downloaded a app called "aviutli" but don't know who to change the header