Hi Bobby,
Unavailability of firebird server or stopped status of firebird service could be the reason for this problem.
Please restart firebird service and try.
Location: Start > Run > services.msc
Or
Control Panel > Administrative Tools > Services
If you are not able to find firebird service in services list then you need to install firebird server. You can download a firebird server set up file from the link below,
http://lenvica.in/downloads/Firebird-2.5.2.exe
Hope this helps.
Regards,
Rijo