Hi Ribin,
1. Please ensure there is path mentioned.
2. Please ensure gbak.exe in the below location:
c:\program files\attendhrm\firebird\bin
3. If gbak.exe is there, please replace it from below location:
c:\program files\firebird\firebird_2_5\bin
4. If not, copy & paste gbak.exe from below location to early mentioned location:
c:\program files\firebird\firebird_2_5\bin