These messages come from the page's background requests. "You need to be logged in!" means your admin session expired: reload and sign in again. "Invalid Permissions !" means your role has the page's List permission but not the one needed for the action, for example Edit Employees Schedule to save a shift, Edit Employees Timesheets to save a timecard, or Edit Employees Shift Requests to create or fill an open shift. Ask an admin to add the permission to your Employee Profile.