Nothink for scj admin

hello
[Tue Apr 23 17:51:57 2013] [error] [client 94.70.47.148] File does not exist: /home/xxxprofi/public_html/500.shtml
only this and some other errors but is because i have other script before install scj
And somethink else in root folder dont have any .htaccess file

Hello i have install the script bbut after install i try go in admin page but i take error message 500 internal server error