Two things;
The default homepage is the homepage for all roles, even if the don't have granted direct access to the page. You can define a roles pecific home page, so that the default home page isn't applicable anymore for that role.
Second,
It seems like that the administrator role doesn't have a related role in the module. Having a user role and module role with an equal name, doesn't automatically connect them. This must be configured in the project security > userrole settings
Hiii Belle, this error occurs because you have not given access to these pages.
No read access error occurs when you have not given access to those attributes (whatever like read or read, write) in entity access tab.