I was creating deb package for kdebase package.I this is the error that I am facing

# Remove build tree
rm -rf /root/kdebase/kdebase-3.3.2/obj-i386-linux
# if Makefile exists run distclean
if test -f Makefile; then \
/usr/bin/make distclean; \
fi
if test -d CVS; then \
/usr/bin/make -f admin/Makefile.common cvs-clean ;\
fi
dh_clean
dpkg-source -b kdebase-3.3.2
dpkg-source: building kdebase using existing kdebase_3.3.2.orig.tar.gz
dpkg-source: building kdebase in kdebase_3.3.2-1sarge3.diff.gz
dpkg-source: cannot represent change to pics/wallpapers/default_gears .png: bi nary file contents changed
dpkg-source: cannot represent change to pics/wallpapers/default_gears1.jpg: bina ry file contents changed
dpkg-source: warning: ignoring deletion of file pics/wallpapers/default_gears.jp g
dpkg-source: building kdebase in kdebase_3.3.2-1sarge3.dsc
dpkg-source: unrepresentable changes to source


what could be the reason and how to solve this.

previously I tried with the same package and the deb package was created.Why is it not getting created now?