Hi Zhang,
Sorry for late response but its worth noting.
I solved the problem some 15 days ago. I uninstalled the system and then reinstalled it, but still the problem was same, then in solution I increased the heap size from 512MB to 1024MB and then it was solved.
But one should be careful inorder to set the heapsize, when I increased it to 2048MB, the Codewarrior IDE begun to crash every time i opened it and the error was "Failed starting Java Virtual Machine". So i had to repeat the above step again.
Regards
Abdullah