Error 91 when clicking on a computer in the list

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When clicking on a computer in the list, as the application tries to find the local users on the computer, an error appears stating:
 
"91 - Object variable or With block variable not set"
 
This problem happens when RLPP cannot find the local users on a computer. This may happen if the item in the list being selected is not a supported Windows NT4, 2000, XP or 2003 computer. For example, if you enumerate by IP Address and find routers, this error will appear when selecting items in the list.
 
It may also happen if something is blocking the call to enumerate local users (ie. Firewall, Lack Of Permissions).
 
It may also be due to incorrect DNS resolution. When you click on a computer in the list, RLPP does a forward DNS resolution to get the IP Address. Once it resolves the name to an IP address it tries to ping the computer. If the Ping is successful, it then attempts to gather the local accounts from the computer.
 
If your computer is listed incorrectly in your local DNS Cache or on the DNS Server it can fail with this error.
 
To troubleshoot:
 
1. Open a command prompt and ping the name of the computer you are trying to select. Make sure it resolves to the correct IP Address of the machine.
 
If it does not resolve correctly:
 
1. At a command prompt, type (no quotes):
"ipconfig /flushdns"
 
2. Check the entries on your DNS Server and make sure the IP and Name pair for this computer is correct.