recipe does not build: make: bzr: ERROR: deb-version not fully expanded:

a recipe does not build due to the wrong version:
https://launchpad.net/~pythonxy/+archive/individual-devel/+recipebuild/162306

#### error#

write to Launchpad or access private data. See "bzr help launchpad-login".
bzr: ERROR: deb-version not fully expanded: {latest-tag}+0ubuntu1+1731. Valid substitutions are: ['{time}', '{date}', '{revno:debianfiles}', '{revno}', '{svn-revno:debianfiles}', '{svn-revno}', '{git-commit:debianfiles}', '{git-commit}', '{latest-tag:debianfiles}', '{latest-tag}', '{debversion:debianfiles}', '{debversion}', '{debupstream-base:debianfiles}', '{debupstream-base}', '{debupstream:debianfiles}', '{debupstream}', '{revdate:debianfiles}', '{revdate}', '{revtime:debianfiles}', '{revtime}']
(0.74404599999999999, 0.080004999999999993, 0, 0, 0, 0, 6565, 16, 0, 7048, 0, 0, 0, 0, 286, 26)
RUN: /usr/share/launchpad-buildd/slavebin/scan-for-processes ['/usr/share/launchpad-buildd/slavebin/scan-for-processes', 'f7838ec5f4c52a1a84acf408881a9e9969789ac9']

###

the log:
https://launchpadlibrarian.net/90900640/buildlog.txt.gz

###

The recipe says:

# bzr-builder format 0.2 deb-version {latest-tag}+0ubuntu1+{revno}
lp:~pythonxy/spyderlib/trunk
nest debianfiles lp:~pythonxy/spyderlib/spyder_devel_debian debian

What is wrong with using '{latest-tag}' in the way like the recipe?

I would like to use it to have my packages always with the latest upstream version tag.