problem using nios ii

Hello all!

Recently,When I used the nios II 7.2 to bulid my project,I find the errors as follow:

make_s all includes

creating generated_app.mk...

compling crt0.s

make[1]:***[crt0.o] Error 57

make:*** [system_project] Error 2

Build completed in 23.172 seconds

The error is independent of my program,that's to say,when I compling any project ,the error appears as same. I installed the quartus7.2 and nios II7.2 again,but the bug appear as usual.THank you for your help!