SSH Session error: "Failed to load identity file"

Hello

 I try to connect with sever by SSH. I put the same data as in Putty (Auth type: key pair). When I start, I get alert window with exclamation and "Failed to load identity file" info.

 When I click "OK" I get again the same window.

I tried with my key private file from directory .ssh and also I copied this file to another folder - still not working.

Any help?