BREW errors

[fotios@fotios ~]$ cvs -d :gserver:cvs.devel.redhat.com:/cvs/dist co rubygem-multi_json
cvs checkout: Updating rubygem-multi_json
U rubygem-multi_json/Makefile
U rubygem-multi_json/import.log
cvs checkout: Updating rubygem-multi_json/RHEL-6-LIBRA
U rubygem-multi_json/RHEL-6-LIBRA/.cvsignore
U rubygem-multi_json/RHEL-6-LIBRA/Makefile
U rubygem-multi_json/RHEL-6-LIBRA/branch
U rubygem-multi_json/RHEL-6-LIBRA/rubygem-multi_json.spec
U rubygem-multi_json/RHEL-6-LIBRA/sources
cvs checkout: Updating rubygem-multi_json/devel
U rubygem-multi_json/devel/.cvsignore
U rubygem-multi_json/devel/Makefile
U rubygem-multi_json/devel/branch
U rubygem-multi_json/devel/rubygem-multi_json.spec
U rubygem-multi_json/devel/sources
cvs checkout: Updating common
U common/Makefile.common
U common/README
U common/branches
U common/build.map
U common/bzcheck.cgi
U common/bzflags.cgi
U common/check_build.py
U common/cvs-import.sh
U common/get-cvs-branch.py
U common/sample.cvsdistrc
U common/tag.cgi
U common/upload.cgi
cvs checkout: Updating common/devel
cvs checkout: Updating rubygem-multi_json-tests
[fotios@fotios ~]$ cd rubygem-multi_json/RHEL-6-LIBRA/
[fotios@fotios RHEL-6-LIBRA]$ make tag
(cd ../common && cvs update)
cvs update: Updating .
cvs update: Updating devel
cvs tag  -c rubygem-multi_json-1_0_3-1_el6
ERROR: The tag rubygem-multi_json-1_0_3-1_el6 is already applied on a different branch
ERROR: You can not forcibly move tags between branches
Run 'cvs tag show' to see the list of tags
cvs tag: Pre-tag check failed
cvs [tag aborted]: correct the above errors first!
make: *** [tag] Error 1