upgrade script throws error messages while doing rpm -U

[root@localhost tmp]# rpm -U couchbase-server-enterprise-5.5.0-1893-centos6.x86_64.rpm Stopping couchbase-server [ OK ] Minimum RAM required : 4 GB System RAM configured : 3.79 GB Minimum number of processors required : 4 cores Number of processors on the system : 4 cores warning: /opt/couchbase/etc/couchdb/local.ini saved as /opt/couchbase/etc/couchdb/local.ini.rpmsave warning: /opt/couchbase/var/lib/couchbase/config/config.dat saved as /opt/couchbase/var/lib/couchbase/config/config.dat.rpmsave Upgrading couchbase-server ... /opt/couchbase/bin/install/cbupgrade -c /opt/couchbase/var/lib/couchbase/config -a yes Automatic mode: running without interactive questions or confirmations. Analysing... Previous config.dat file is /opt/couchbase/var/lib/couchbase/config/config.dat.rpmsave Target node: ns_1@127.0.0.1 Traceback (most recent call last): File "/opt/couchbase/bin/install/cbupgrade", line 487, in <module> main() File "/opt/couchbase/bin/install/cbupgrade", line 346, in main print 'Error getting node config": {}'.format(p.communicate()[0]) ValueError: zero length field name in format warning: %post(couchbase-server-5.5.0-1893.x86_64) scriptlet failed, exit status 1 Starting couchbase-server [ OK ] You have successfully installed Couchbase Server. Please browse to

  http://localhost.localdomain:8091/

to configure your server. Please refer to

  http://couchbase.com

for additional resources. Please note that you have to update your firewall configuration to allow connections to the following ports: 4369, 8091 to 8094, 9100 to 9105, 9998, 9999, 11207, 11209 to 11211, 11214, 11215, 18091 to 18093, and from 21100 to 21299. By using this software you agree to the End User License Agreement. See /opt/couchbase/LICENSE.txt.