I have wrong things with my de2_web example

i have the full version of quatus6.1 and nios2 6.1,i also can see the uc/os2 template in nios2 6.1 IDE, but when i run the de2_web example downloaded from www.terasic.com ,there is always an error to say there are some mistakes in certain files:

error:"d/altera/61/nios2eds/components/micrium_uc_osii/UCOSII/inc/ucos_ii.h:357: error: parse error before "OS_FLAGS"".also some erros in the same file.

i don't know why.