olimex Jtag

hi

I am Woking with AVR STudio 4 and with the olimex Jtag.

I worked with it allready. But now i got a new Hardware, i can upload the hex file, but when open the main.hex out of AVR studio to start debugging with Jtag, i got the following error: coud not set timers runing parameter. unable to continue connect sequece.

does anyone know wher the mistake coud be. Probably somesthing with the Makefile, or a hardware mistake.