浏览器提示Internal Server Error

提示：

 

Internal Server Error

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

Please contact the server administrator, [no address given] 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.

后发现是因为我改了.htaccess文件，不知道为什么……