error during Qsys system generation

Hi ,

I wanted to explore NIOS 2 processor, so I started with NIOS 2 Hardware development tutorial. After I create the Qsys design, I am unable to generate the the hdl files for synthesis . It gets struck giving a warning

Warning: "No matching role found for jtag_uart_0:avalon_jtag_slave:dataavailable (dataavailable)"

But I cannot ignore the warning as the generation stalls.

Can someone provide me any suggestion on how to generate the files and why it happens and how to overcome this problem

Thanks for your time..

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