Regenerate thumbnails 图像问题

[i978]

我修改了图像的大小的。如附件图。当我选择Regenerate thumbnails时，出现：
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Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.warestrading.com Port 80
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这是为什么？网站所有图片都无法显示，看附件图。
我使用的是BLUEHOST Linux主机，/IMG及子文件夹设置的权限为744。

有谁能帮我一下？谢谢！

[Lonki]

img是744? 怎么通过安装的.... 它要求img及其下的都是777啊: chmod -R 777 img 看看
看下web的error log呢

睡了先, 明天再说... ...