Revoking a node from the vertica cluster failed

Hi All, Recently, I tried to revok a node from a vertica cluster.Unfortunately, I got the below error: [root@node29-priv ~]# /opt/vertica/sbin/update_vertica -R 111.1.1.61 Vertica Analytic Database 6.1.1-0 Installation Tool Starting installation tasks... Getting system information for cluster (this may take a while).... backing up admintools.conf on 111.1.1.61 backing up admintools.conf on 111.1.1.60 backing up admintools.conf on 111.1.1.52 backing up admintools.conf on 111.1.1.53 backing up admintools.conf on 111.1.1.50 backing up admintools.conf on 111.1.1.51 backing up admintools.conf on 111.1.1.56 backing up admintools.conf on 111.1.1.57 backing up admintools.conf on 111.1.1.54 backing up admintools.conf on 111.1.1.55 backing up admintools.conf on 111.1.1.49 backing up admintools.conf on 111.1.1.48 backing up admintools.conf on 111.1.1.58 backing up admintools.conf on 111.1.1.59 Error: cannot concatenate 'str' and 'NoneType' objects Traceback (most recent call last): File "/opt/vertica/bin/verticaInstall.py", line 1045, in (ok, rpmBrand, rpmVersion, rpmRelease, rpmArch) = SSH.rpmVersion( options.rpm_file_name ) #( v.isInstalled(), v.brand, v.version, v.release,v.arch) File "/opt/vertica/oss/python/lib/python2.7/site-packages/vertica/network/SSH.py", line 334, in rpmVersion cmd = "rpm -qp " + rpmFileName + " --qf \"%{NAME} %{VERSION} %{RELEASE} %{ARCH}\\n\"" TypeError: cannot concatenate 'str' and 'NoneType' objects Installation failed. Not sure, this is a bug or my misoperation.Coud you please do me a favor to check this error. Thanks in advance. Regards, Kesking