I edited index.php in a copy of the default theme (v. 188.8.131.52). I made several code errors, and decided to revert back to the last working copy of index.php. When I uploaded the original file, Firefox returned a mostly blank page with only a zero.
I then changed the active theme back to default instead of my copy of default but the error persisted.
I called my hosting company and was told that there was no database configuration file. Is there a way to fix whatever I did or should I delete the database, delete the directory where I installed ZenPhoto, and then start over with a clean installation?