We first uninstall firebird by opening the Microsoft Windows Control Panel. Then open Programs and Features. From here, we uninstall the following two programs.
1. Firebird 126.96.36.199539
2. Firebird Database Updater
Now we reinstall firebird
Open C:\Multifocal\Firebird and Utilities
Double click Firebird Installer(v6).exe
You can click next through the whole installation process, no settings need to be changed.
After that is done, you may need to reconnect yo your database in Database manager in the Espion software.
If you still get an error, reinstall Espion one more time now that firebird has been reinstalled. Let me know if that helps or not.