Data provider list is empty within the "Create Data Connection Wizard" in Essentials Manager

Overview:
The data provider list is empty when trying to create a new data connection in Essentials Manager.

Solution:
There is a known issue in .NET that will cause a repeated value in the machine.config file. To solve this issue, follow the steps:

1. Make a backup of the file C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config
2. Edit that file and look for the tag <DbProviderFactory>. The section will look like:

   <DbProviderFactories>
           [...]
       </DbProviderFactories>  
       <DbProviderFactories/>  --> Extra line

3. Delete the extra line and then save the file.
4. Repeat steps 1 through 5 for the file C:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config  (note the path is different that the other file - ..\framework64\..)