This issue is related to files and folder permission in your server, if you used root user for example to extract files and run composer update then it will cause permission errors on the web part because apache is using account user not root user.
Glad you have it fixed, please let us know if this was the issue or now.
you can use the chown command to change file ownership
chown -R [account user]:[account group] [your installation location]
also chmod command can be used to change file permissions
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