When we attempt to create package in umbraco cms we unknowingly get Root element is missing. So how we will kill Root element is missing error.See below Image error which you are getting.
Steps to remove these error:
Step1 : Go to folder where you have installed your umbraco.
In my system i have this path D:\Project\Umbraco9\UmbracoCms.4.9.0\App_Data\packages\created
Step2: Open CreatedPackages.config file you will notice that there is nothing I mean completely blank.
Step3: Add below code and save.
<?xml version="1.0" encoding="utf-8"?> <packages> </packages>
Step4 : Now go to umbraco site and create package and enjoy.