Hello. I'm trying to do an upgrade from zimbra 7.1.1 to 7.1.3 in a single node stage. but when I execute ./install -c active in the active node, i have the next ouput:

[root@nodo1 zcs-NETWORK-7.1.3_GA_3346.RHEL5_64.20110928134534]# ./install.sh -c active
Installing a cluster active node.

Enter the active cluster service name for this node: [mail.prueba.com]
Can't locate XML/Parser.pm in @INC (@INC contains: lib /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) at bin/zmclusterupgrade.pl line 14.
BEGIN failed--compilation aborted at bin/zmclusterupgrade.pl line 14.
Cluster pre-upgrade steps failed.
Possible causes include:
- Failure to disable mail.prueba.com via clusvcadm.
- Failure to stop ZCS processes or unmount SAN volumes via clusvcadm.
- Failure to manually add service IP or mount SAN volumes.
Please check your logs for appropriate errors.
After you correct the problems you can safely rerun the cluster upgrade.

My cluster work's fine but I don't know what's happening.