What's the problem?
 

Warning: fopen(/home/username/public_html/data/1/thumbs/index.htm) [function.fopen]: failed to open stream: Permission denied in /home/username/public_html/install.php on line 1046

Warning: fclose(): supplied argument is not a valid stream resource in /home/username/public_html/install.php on line 1047

Warning: fopen(/home/username/public_html/data/1/large/index.htm) [function.fopen]: failed to open stream: Permission denied in /home/username/public_html/install.php on line 1052

Warning: fclose(): supplied argument is not a valid stream resource in /home/username/public_html/install.php on line 1053

Warning: fopen(/home/username/public_html/data/2/thumbs/index.htm) [function.fopen]: failed to open stream: Permission denied in /home/username/public_html/install.php on line 1046

Warning: fclose(): supplied argument is not a valid stream resource in /home/username/public_html/install.php on line 1047

Warning: fopen(/home/username/public_html/data/2/large/index.htm) [function.fopen]: failed to open stream: Permission denied in /home/username/public_html/install.php on line 1052

Warning: fclose(): supplied argument is not a valid stream resource in /home/username/public_html/install.php on line 1053

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/install.php:1046) in /home/username/public_html/install.php on line 1232

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/install.php:1046) in /home/username/public_html/install.php on line 1233


Please advice what should I do?
Thanks..

On install you must set the data directory at every level to 777

So can I set the data directory to 777 now?
Without going through the reinstall process again.

You can try if you went through the install all the way. If not you need to rerun install