Cobbler reposync failed

I run daily cobbler reposync crons and it appears sometimes the process fails with the following error :

 Exception occured: <class 'cobbler.cexceptions.CX'>  
 Exception value: 'cobbler reposync failed'  
 Exception Info:  
  File "/usr/lib/python2.6/site-packages/cobbler/utils.py", line 126, in die  
   raise CX(msg)  
   
 Exception occured: <class 'cobbler.cexceptions.CX'>  
 Exception value: 'cobbler reposync failed'  
 Exception Info:  
  File "/usr/lib/python2.6/site-packages/cobbler/action_reposync.py", line 125, in run  
   self.sync(repo)  
   File "/usr/lib/python2.6/site-packages/cobbler/action_reposync.py", line 169, in sync  
   return self.yum_sync(repo)  
   File "/usr/lib/python2.6/site-packages/cobbler/action_reposync.py", line 402, in yum_sync  
   utils.die(self.logger,"cobbler reposync failed")  
   File "/usr/lib/python2.6/site-packages/cobbler/utils.py", line 134, in die  
   raise CX(msg)  
...
!!! TASK FAILED !!!

I don't really have an explanation for this but it seems that the reposync process doesn't really fail as if I run the reposync command manually the process goes fine.

The createrepo command line is shown when you execute "cobbler reposync", for example :

 hello, reposync  
 run, reposync, run!  
 creating: /var/www/cobbler/repo_mirror/Dell-CentOS5/.origin/Dell-CentOS5.repo  
 running: /usr/bin/reposync -l -m -d --config=/var/www/cobbler/repo_mirror/Dell-CentOS5/.origin/Dell-CentOS5.repo --repoid=Dell-CentOS5 --download_path=/var/www/cobbler/repo_mirror  

In this case the command line is :

reposync -l -m -d --config=/var/www/cobbler/repo_mirror/Dell-CentOS5/.origin/Dell-CentOS5.repo --repoid=Dell-CentOS5 --download_path=/var/www/cobbler/repo_mirror  

The process should go fine, however the return value $? is '1' which can explain why the cobbler commands fails.