Altera Debug Client: cannot exec "ccl"

Hi,

I got this problem while trying to compile a C file using Altera Debug Client 2.0

"

nios2-elf-gcc: installation problem, cannot exec `cc1': no such file or directory

nios2-elf-gcc: installation problem, cannot exec `cc1': no such file or directory

"

I am tickling my head over but I am not able to find out the reason. Please give me some expert advice on this. thanks.