最近打开，unity hub发现打开不了项目。一打开unity hub就刷新，就打不开了。但可以新建项目，能打开，之后退出就打不开了。（2020 2019都打不开）Package Manager说This package is not available to use because there is no license registered for your user. If you believe you have permission to use this package, refresh your license in the license management window of Unity Hub. Otherwise, contact your administrator.但我是administrator。我重装unity hub unity都没用。更新许可证没用，重新登录没用，重启没用。求！求！