How to build uclinux to DE2 board ,please help!

Thanks very much ,I made it ,boot the uclinux on the DE2 ,but the second time ,I got an error

that I've never seen before,It's as below .I use the .ptf file of the example in the DE2 DISK,so I

think it seems not the problem of .ptf file itselt,so what's the problem and how should I solve it ?

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[mxp@localhost uClinux-dist-test]$ make menuconfig

config/mkconfig > config.in

make -C /home/mxp/uClinux-dist-test/config/scripts/lxdialog all

make[1]: Entering directory `/home/mxp/uClinux-dist-test/config/scripts/lxdialog'

make[1]: Leaving directory `/home/mxp/uClinux-dist-test/config/scripts/lxdialog'

Using defaults found in .config

Preparing scripts: functions, parsing...done.

Saving your kernel configuration...

*** End of Linux kernel configuration.

*** Check the top-level Makefile for additional configuration.

*** Next, you must run 'make dep'.

[mxp@localhost uClinux-dist-test]$ make linux_hwselect SYSPTF=nios_0.ptf

KCONFIG_NOTIMESTAMP=1 make ARCH=nios2nommu CROSS_COMPILE=nios2-linux-uclibc- ARCH=nios2nommu CROSS_COMPILE=nios2-linux-uclibc- -C linux-2.6.x hwselect

no emulation specific options.

make[1]: Entering directory `/home/mxp/uClinux-dist-test/linux-2.6.x'

RUNNING hwselect

ERROR: Could not open SYSTEM ptf file. //<------Q Here.

make[1]: Leaving directory `/home/mxp/uClinux-dist-test/linux-2.6.x&#39;

[mxp@localhost uClinux-dist-test]$

[mxp@localhost uClinux-dist-test]$ ls

autoconf.h COPYING linux-2.0.x openswan uClinux-dist.diff.gz

bin Documentation linux-2.4.x README user

config freeswan linux-2.6.x SOURCE vendors

config.arch include Makefile tools

config.in lib nios_0.ptf uClibc

[mxp@localhost uClinux-dist-test]$