make vendor_hwselect problem

I take the BinaryToolchain for building kernel,when i take the step:

make vendor_hwselec SYSPTF=~/your_hardware_project/your_system.ptf

I use the nios_0.ptf for DE2_NET project,and this file is in uClinux-dist dir

Then i do as these:

[nios@www uClinux-dist]$ make vendor_hwselect SYSPTF=nios_0.ptf

But errors happend:

make ARCH=nios2nommu -C vendors vendor_hwselect

make[1]: Entering directory `/home/nios/download/uClinux-dist/vendors'

make -C /home/nios/download/uClinux-dist/vendors/Altera/nios2nommu/. dir_v=/home/nios/download/uClinux-dist/vendors/Altera/nios2nommu/. -f /home/nios/download/uClinux-dist/vendors/vendors-common.mak vendor_hwselect

make[2]: Entering directory `/home/nios/download/uClinux-dist/vendors/Altera/nios2nommu'

make ARCH=nios2nommu CROSS_COMPILE=nios2-linux-uclibc- -C /home/nios/download/uClinux-dist/linux-2.6.x hwselect

no emulation specific options.

make[3]: Entering directory `/home/nios/download/uClinux-dist/linux-2.6.x'

RUNNING hwselect

ERROR: Could not open SYSTEM ptf file.

make[3]: Leaving directory `/home/nios/download/uClinux-dist/linux-2.6.x'

make[2]: Leaving directory `/home/nios/download/uClinux-dist/vendors/Altera/nios2nommu'

make[1]: Leaving directory `/home/nios/download/uClinux-dist/vendors'

what is wrong? thank you!!!