Php Whmcs更新失败，chmod（）：不允许操作

嗨，更新whmcs有问题吗

 Error: chmod(): Operation not permitted
[ErrorException]
Script WHMCS\Installer\Composer\Hooks\ComposerInstallerHook::postUpdateCmd handling the post-update-cmd event terminated with an exception
Relocating WHMCS core files...
Skipping: templates_c
Preparing to relocate WHMCS core files...
An existing installation has been found - updating...
-------------------------------------
WHMCS Installation/Update Assistant
-------------------------------------
> WHMCS\Installer\Composer\Hooks\ComposerInstallerHook::postUpdateCmd
Writing lock file
File signature was validated
Certificate used for signature validation was loaded and validated
File hash was validated. Hash: 2c5b558699d17083cac00100d427e4e0292b9c3119cb8e21e7d979cf7b2f3fac
Validating /var/www/html/billing/vendor/whmcs/whmcs/681532b59f956df171883cb9f0d0c265.zip
Downloading
- Installing whmcs/whmcs (7.10.3)
Updating dependencies
Loading composer repositories with package information

已添加对www数据的权限 chmod g+w/var/www/html chgrp-R www-data/var/www/html