Dear Kai,
Thank you very much for your suggestionn and comments. Actually, I've used a known circuit for programming. I also used the same schematic before on a different project. There was not any situation like this. I could not find any mistake on my board and controlled the programming cables whether they are touching correctly or not. And finally, as you recomended, I tried to initialised the target first but, the problem goes on...

Thank you very much for your commnets again. Waiting for any others...

Best Regards,
Batu C.