If this happen to you, when you just set up new child theme or just trying, wp theme crash, and wp system also . Trying to upload fresh wp system or reupload new theme not helped. What should do?

This is happen to me, i found my browser display this message

Warning: require_once() [function.require-once]: Unable to access /home/your_id/public_html/wp-content/themes/IzultheaNT-child/admin/color-core.php in /home/your_id/public_html/wp-content/themes/IzultheaNT/functions.php on line 44

Warning: require_once(/home/your_id/public_html/wp-content/themes/IzultheaNT-child/admin/color-core.php) [function.require-once]: failed to open stream: No such file or directory in /home/your_id/public_html/wp-content/themes/IzultheaNT/functions.php on line 44

Fatal error: require_once() [function.require]: Failed opening required ‘/home/your_id/public_html/wp-content/themes/IzultheaNT-child/admin/color-core.php’ (include_path=’.:/usr/lib/php’) in /home/your_id/public_html/wp-content/themes/IzultheaNT/functions.php on line 44

i keep trying to reupload wp system- not help.
i change theme, not help.
i reupload from backup theme, also not help.

finally, i remove child theme and  i rename the crashed theme (main theme), by add ‘x’ in front the theme folder name via ftp. and… it worked!!