gaudirun not running with LbEnv

Dear all, I have recently encountered an issues while trying to test a decfile using LbEnv. Here is a minimal non working example:

from lxplus6

source /cvmfs/lhcb.cern.ch/lib/LbEnv
lb-set-platform x86_64-slc6-gcc49-opt
lb-dev Gauss/v49r12
cd ./GaussDev_v49r12
git lb-clone-pkg  Gen/DecFiles
make install
./run gaudirun.py

Gives

./run: line 23: .: SetupProject.sh: file not found

As an additional information:

which SetupProject.sh

/usr/bin/which: no SetupProject.sh in (/cvmfs/lhcb.cern.ch/lib/bin/x86_64-slc6:/cvmfs/lhcb.cern.ch/lib/bin/Linux-x86_64:/cvmfs/lhcb.cern.ch/lib/bin:/cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/499/stable/x86_64-slc6/bin:/usr/sue/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/opt/puppetlabs/bin)

The same procedure is working fine using LbLogin instead of LbEnv.

source /cvmfs/lhcb.cern.ch/group_login.sh
LbLogin -c x86_64-slc6-gcc49-opt
lb-dev Gauss/v49r12
cd ./GaussDev_v49r12
git lb-clone-pkg  Gen/DecFiles
make install
./run gaudirun.py

cheers, Fabrice