just finished my upgrade for probably the 3rd time.... i have installed it in a folder called newstore. I also went through and compared every file and moved the correct ones with customizations to my 1.5 version. I upgraded the database successfully through newstore/zc_install/index.php. after the upgrade i cannot access my admin panel or my site at mydomain/newstore. i keep getting an internal server error. how can i debug this? or does anyone have a solution or idea?