I'm new to firebird as my database server

I have already a database named HIS_sample.GDB which is located to 
D:\HIS\Database.
every time i try to connect to my database using:
CONNECT "localhost:D:\HIS\Database\HIS_sample.GDB" user "SYSDBA" password 
"masterkey"; an error massage pops SQLstatement failed, SQLState=HY000; 
unsuported on-disk structure for file D:\HIS\Database\HIS_sample.GDB found 
11.2, support 11.2

im firebird version 2.5 with an OS of of Windows7 32 bit and windows2008

can you help me how to fix it please?

thank you!

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