Hello, In fact, I copied the file DBI.pm at the directory where otrs try to find the file instead of making a link between the two file. But I got another error Software error: Can't locate loadable object for module DBI in @INC (@INC contains: /opt/otrs/bin/cgi-bin /opt/otrs/bin/Custom /opt/otrs/bin/Kernel/cpan-lib /opt/otrs/bin /opt/otrs/bin/cgi-bin/../../Kernel/cpan-lib /opt/otrs/bin/cgi-bin/../.. /usr/local/perl/lib/5.10.0/i686-linux /usr/local/perl/lib/5.10.0 /usr/local/perl/lib/site_perl/5.10.0/i686-linux /usr/local/perl/lib/site_perl/5.10.0 .) at /opt/otrs/bin/cgi-bin/DBI.pm line 263 BEGIN failed--compilation aborted at /opt/otrs/bin/cgi-bin/DBI.pm line 263. Compilation failed in require at /opt/otrs/bin/cgi-bin/../../Kernel/System/DB.pm line 21. BEGIN failed--compilation aborted at /opt/otrs/bin/cgi-bin/../../Kernel/System/DB.pm line 21. Compilation failed in require at /opt/otrs/bin/cgi-bin/../../Kernel/System/Web/InterfacePublic.pm line 27. BEGIN failed--compilation aborted at /opt/otrs/bin/cgi-bin/../../Kernel/System/Web/InterfacePublic.pm line 27. Compilation failed in require at /opt/otrs/bin/cgi-bin/public.pl line 39. BEGIN failed--compilation aborted at /opt/otrs/bin/cgi-bin/public.pl line 39. For help, please send mail to the webmaster (webmaster@localhostmailto:webmaster@localhost), giving this error message and the time and date of the error. Doing a copy of file like that is not allowed? Best regards, Xiaoxing