When installing a theme in opencart "You do not have permission to change settings", how to fix?

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When installing a theme in opencart "You do not have permission to change settings" how to fix?
In users-group of users set all the checkboxes.
It may be important that sometimes the error "Invalid token session. Log in again." I don't understand why either. Help me please

Answer 1

1. Add checkboxes (grant rights) to users/user groups. If you are an administrator
2. Token session: Try in IE (Internet explorer with a standard browser) to open the admin panel