Herwig configuration

On lxplus using

alienv enter VO_ALICE@AliGenerators::v20190909-1

I encounter the following problem when launching Herwig:

[AliGenerators/v20190909-1] profile.d > Herwig read
Error: Could not find repository ‘/build/workarea/sw/20156049/1/INSTALLROOT/105f0a97d417971831ebacc0fcb8aa7a3496aa30/slc6_x86-64/Herwig/v7.1.2-alice1-9/share/Herwig/HerwigDefaults.rpo’.

HERWIG_ROOT is properly set

[AliGenerators/v20190909-1] ~ > echo $HERWIG_ROOT
/cvmfs/alice.cern.ch/el6-x86_64/Packages/Herwig/v7.1.2-alice1-9

So where is the problem ?