I am attempting to build a Debian package using pdebuild on my main development server (running Debian wheezy). Here is the command I run:

pdebuild --pbuilder cowbuilder --buildresult .. \
         --debbuildopts -i -- \
         --basepath /var/cache/pbuilder/base-wheezy.cow \
         --distribution wheezy --configfile /etc/pbuilder/wheezy

This works on other servers, but on one server I get this output:

I: using cowbuilder as pbuilder
dpkg-buildpackage: source package libexample-orange-util-perl
dpkg-buildpackage: source version 0.08
dpkg-buildpackage: source changed by John User <[email protected]>
 dpkg-source -i --before-build libexample-orange-util-perl
 fakeroot debian/rules clean
dh clean
   dh_testdir
   dh_auto_clean
   dh_clean
 dpkg-source -i -b libexample-orange-util-perl
dpkg-source: info: using source format `3.0 (native)'
dpkg-source: info: building libexample-orange-util-perl in libexample-orange-util-perl_0.08.tar.gz
dpkg-source: info: building libexample-orange-util-perl in libexample-orange-util-perl_0.08.dsc
 dpkg-genchanges -S >../libexample-orange-util-perl_0.08_source.changes
dpkg-genchanges: including full source code in upload
 dpkg-source -i --after-build libexample-orange-util-perl
dpkg-buildpackage: source only upload: Debian-native package
File not found: ../libexample-orange-util-perl_0.08.dsc

There is no file ../libexample-orange-util-perl_0.08.dsc, but on other build servers no such file is needed (it gets created by the package build).

What is causing this "file not found" error?