安裝dedecms出現500 Internal Server Error,請教高手怎麼解決

請教高手，該怎麼解決
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The server encountered an unexpected condition which prevented it from fulfilling the request. 8 v0 x, u4 f7 g7 S( }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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讀寫權限都已經設置了啊