[otrs] cvsweb file access

It seems that I can not access the files from cvsweb, I get the following error : -- Error: Unexpected output from cvs co: cvs [checkout aborted]: Absolute module reference invalid: `/otrs/Kernel/Output/HTML/Agent.pm' Check whether the directory /home/cvs/CVSROOT exists and the script has write-access to the CVSROOT/history file if it exists. The script needs to place lock files in the directory the file is in as well. -- I can browse the tree, only the 'download' links report this error. I am behind a http proxy. I hope it is not on my side but I don't think so, as i could access cvs files previously from cvsweb Brice