403 错误

GD5588

我将zencart安装文件传到服务器的根目录下，在IE敲入域名后出现以下错误:

Forbidden
You don't have permission to access / on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request
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请问高手该错误是什么原因引起？