我有一个php空间，上传了个php留言本，能浏览，但写如（留言）时候，就提示Warning: fopen("./data/main.dat","w") - Permission denied in /home/web/tomgo/public_html/gb/index.php on line 145

Warning: Supplied argument is not a valid File-Handle resource in /home/web/tomgo/public_html/gb/index.php on line 146

Warning: Supplied argument is not a valid File-Handle resource in /home/web/tomgo/public_html/gb/index.php on line 147

Warning: Cannot add header information - headers already sent by (output started at /home/web/tomgo/public_html/gb/index.php:145) in /home/web/tomgo/public_html/gb/index.php on line 149

Warning: Cannot add header information - headers already sent by (output started at /home/web/tomgo/public_html/gb/index.php:145) in /home/web/tomgo/public_html/gb/index.php on line 150

Warning: Cannot add header information - headers already sent by (output started at /home/web/tomgo/public_html/gb/index.php:145) in /home/web/tomgo/public_html/gb/index.php on line 151

Warning: Cannot add header information - headers already sent by (output started at /home/web/tomgo/public_html/gb/index.php:145) in /home/web/tomgo/public_html/gb/index.php on line 152
是怎么回事呢？？？？
同空间用户使用同样留言本好好的，一点问题都没有？？？？
请问怎么调试才行呢？？？？