How to solve phpcms upload prompt error 500

Problem:

A 500 error occurred when uploading the background of a website made with PHPCMS;

The source code has not been touched before. Other websites made with PHPCMS can upload pictures normally. The server is Alibaba Cloud, the space is sufficient, and the pictures are not large. The problem occurred when I clicked upload after selecting the picture. At that moment, except that attachments could not be uploaded, everything else was normal, including adding and deleting columns, and publishing articles without pictures. Baidu couldn't solve the problem. Please give me some advice!

Solution:

Set the permissions of each directory to 777 and then restart the server.

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