OPatch error

Hello everybody.

I'm a newbie in applying/installing Oracle patches.
I'm trying to upgrade the Discoverer from 4i to 10g and for this I'm supposed to install this update (among others): 2291496.
Since I didn't do this until now, I read on the Internet and I'm trying to use OPatch to install the update.
I downloaded the file, extracted it, uploaded on the server in the oracle user's home directory.
I logged on with the oracle user, set the $ORACLE_HOME env and tried to call the opatch apply command.

This is the command line:

[oracle@ispdevtst 2291496]$ /u01/oracle/ispdb/9.2.0/OPatch/opatch apply
PERL5LIB=/u01/oracle/ispdb/9.2.0//Apache/perl/lib/5.00503:/u01/oracle/ispdb/9.2.0/OPatch/perl_modules; export PERL5LIB
/u01/oracle/ispdb/9.2.0//Apache/perl/bin/perl /u01/oracle/ispdb/9.2.0/OPatch/opatch.pl apply
Oracle Home = /u01/oracle/ispdb/9.2.0/
Location of Oracle Universal Installer components = /u01/oracle/ispdb/9.2.0/oui
Location of OraInstaller.jar = "/u01/oracle/ispdb/9.2.0/oui/jlib"
Oracle Universal Installer shared library = /u01/oracle/ispdb/9.2.0/oui/lib/linux/liboraInstaller.so
Location of Oracle Inventory Pointer = /etc/oraInst.loc
Location of Oracle Inventory = /u01/oracle/ispdb/9.2.0/inventory
Path to Java = /u01/oracle/ispdb/9.2.0/jre/1.4.2/bin/java

oracle.ops.mgmt.cluster.ClusterInfoException: CMCLI ERROR: OpenCommPort: connect failed with error 2. /u01/oracle/ispdb/9.2.0/oui/bin/lsnodes.bin: struct size 0
at oracle.ops.mgmt.cluster.ClusterInfo.getNodeNames(ClusterInfo.java:259)
at oracle.sysman.oii.oiip.oiipg.OiipgVendorClusterwareInfo.isCluster(OiipgVendorClusterwareInfo.java:75)
at oracle.sysman.oii.oiip.oiipg.OiipgDetectCluster.isCluster(OiipgDetectCluster.java:149)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at opatch.OuiDep.isCluster(OuiDep.java:96)
at opatch.O2O.setIsCluster(O2O.java:724)
at opatch.O2O.queryRAC(O2O.java:801)
at opatch.O2O.setupInventoryThenRAC(O2O.java:921)
at opatch.GetPlatformID.main(GetPlatformID.java:43)

OPatch Version 1.0.0.0.51
Perl Version 5.00503

/u01/oracle/ispdb/9.2.0/OPatch/opatch.pl version: 1.0.0.0.51
Copyright (c) 2001-2004 Oracle Corporation. All Rights Reserved.

The patch directory area must be a number.

ERROR: OPatch failed because of problems in patch area.
[oracle@ispdevtst 2291496]$

Can anyone tell what can I do or what am I doing wrong here ?

Thank you and regards,
Sorin Miroiu