安装dedecms出现500 Internal Server Error,请教高手怎么解决

z1981h0927u

请教高手，该怎么解决

The server encountered an unexpected condition which prevented it from fulfilling the request. The script had an error or it did not produce any output. If there was an error, you should be able to see it in the error log.

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z1981h0927u

读写权限都已经设置了啊