Can't locate RT/Shredder/Exception.pm

While trying to restart the fcgi server I had the following error which prevent the server to start :

Can't locate RT/Shredder/Exception.pm: ./RT/Shredder/Exception.pm: Permission denied at /usr/local/share/perl/5.20.2/base.pm line 100.#012#011...propagated at /usr/local/share/perl/5.20.2/base.pm line 109.#012BEGIN failed--compilation aborted at /opt/rt4/sbin/../lib/RT/Shredder/Exceptions.pm line 66.#012Compilation failed in require at /opt/rt4/sbin/../lib/RT/Shredder/Dependencies.pm line 53.#012BEGIN failed--compilation aborted at /opt/rt4/sbin/../lib/RT/Shredder/Dependencies.pm line 53.#012Compilation failed in require at /opt/rt4/sbin/../lib/RT/Record.pm line 78.#012BEGIN failed--compilation aborted at /opt/rt4/sbin/../lib/RT/Record.pm line 78.#012Compilation failed in require at /usr/local/share/perl/5.20.2/base.pm line 100.#012#011...propagated at /usr/local/share/perl/5.20.2/base.pm line 109.#012BEGIN failed--compilation aborted at /opt/rt4/sbin/../lib/RT/User.pm line 71.#012Compilation failed in require at /usr/local/share/perl/5.20.2/base.pm line 100.#012#011...propagated at /usr/local/share/perl/5.20.2/base.pm line 109.#012BEGIN failed--compilation aborted at /opt/rt4/sbin/../lib/RT/CurrentUser.pm line 94.#012Compilation failed in require at /opt/rt4/sbin/../lib/RT/Handle.pm line 245.

It looks like a typo in some files having Exceptions.pm with and without ā€˜sā€™.
To being able to restart the server, I added a a symbolic link :
cd /opt/rt4/lib/RT/Shredder
ln -s Exceptions.pm Exception.pm