While working with the Explorer Add-in, you might receive the following error:
The Web Application object cannot be created using the URL specified.
You can try the following solutions:
1. Open Central Administration & Ensure the URL is correct
Open Central Administration > Manage web applications link
2. Execute the application from a Machine within Farm Environment & using the Farm Account.
In the Farm Machine, you an use CMD.EXE > RUNAS command to start Squadron in Farm Account context.
You can also try the http://localhost url within the farm environment.
Squadron is a Free SharePoint Administration tool available at www.sharepointcto.com.