I get this:
Warning: fopen(/home/mysite/public_html/serendipity_config_local.inc.php): failed to open stream: Permission denied in /home/mysite/public_html/include/functions_installer.inc.php on line 36

Your Serendipity installation is now upgraded to version 0.9.1


Nothing has been upgraded ...

I have already installed and been using the program but my server went strange and now I am getting this error, can anybody help me fix it??

Warning: main(/home/mysite/public_html//serendipity_config_local.inc.php): failed to open stream: Permission denied in /home/mysite/public_html/serendipity ...