Opatch error ..when opatch lsinventory

Hi
I installed Oracel release2 9i and applied aptch 9.2.0.7.0.It went on successful.But now when i try to apply CPU path Jan 2006 i am getting error.Wgen i enter "opatch lsinventory" i get the following error.Please let me know the solution for this.

$ opatch lsinventory

Oracle Interim Patch Installer version 1.0.0.0.55
Copyright (c) 2006 Oracle Corporation. All Rights Reserved..

We recommend you refer to the OPatch documentation under
OPatch/docs for usage reference. We also recommend using
the latest OPatch version. For the latest OPatch version
and other support related issues, please refer to document
293369.1 which is viewable from metalink.oracle.com

opendir(/u01/app/oracle/product/920/../../../../..): Permission denied at /u01/app/oracle/product/920/OPatch/perl_modules/Command.pm line 8135
pwd: cannot determine current directory!
pwd: cannot determine current directory!
pwd: cannot determine current directory!
pwd: cannot determine current directory!
Oracle Home =
Location of Oracle Universal Installer components = /u01/app/oracle/product/920/oui
Location of OraInstaller.jar = "/u01/app/oracle/product/920/oui/jlib"
Oracle Universal Installer shared library = /u01/app/oracle/product/920/oui/lib/solaris/liboraInstaller.so
Location of Oracle Inventory Pointer = /var/opt/oracle/oraInst.loc
Location of Oracle Inventory = /u01/app/oracle/product/920/inventory
Path to Java = /u01/app/oracle/product/920/jdk/jre/bin/java
Log file = /.patch_storage//*.log

pwd: cannot determine current directory!
pwd: cannot determine current directory!
pwd: cannot determine current directory!
pwd: cannot determine current directory!
pwd: cannot determine current directory!
Creating log file "/u01/app/oracle/product/920/.patch_storage/LsInventory__02-24-2006_00-23-25.log"

Exception in thread "main" java.lang.NoClassDefFoundError: opatch/LsInventory
Result:
OPatch succeeded.

Thanks

permissions on all the file -correct version of perl installed?