Migrated dataloader CLIQ scripts from Solaris to AIX Scripts are WORKING WELL IN SOLARIS BUT GETTING ERROR IN AIX AS BELOW

2012-12-05 05:53:55,652 INFO  [main] controller.Controller initLog (Controller.java:388) - The log has been initialized
2012-12-05 05:53:55,665 INFO  [main] process.ProcessConfig getBeanFactory (ProcessConfig.java:103) - Loading process configuration from config file: /u01/psoft/epm900_851/bin/SFDC/dataloader_QA/cliq_process/EXPORT/config/process-conf.xml
2012-12-05 05:53:55,937 INFO  [main] xml.XmlBeanDefinitionReader loadBeanDefinitions (XmlBeanDefinitionReader.java:315) - Loading XML bean definitions from file [/u01/psoft/epm900_851/bin/SFDC/dataloader_QA/cliq_process/EXPORT/config/process-conf.xml]
2012-12-05 05:53:56,110 FATAL [EXPORT] process.ProcessRunner topLevelError (ProcessRunner.java:238) - Unable to run process EXPORT
java.lang.NullPointerException
        at com.salesforce.dataloader.controller.Controller.<init>(Controller.java:105)
        at com.salesforce.dataloader.controller.Controller.getInstance(Controller.java:211)
        at com.salesforce.dataloader.process.ProcessRunner.run(ProcessRunner.java:110)
        at com.salesforce.dataloader.process.ProcessRunner.run(ProcessRunner.java:100)
        at com.salesforce.dataloader.process.ProcessRunner.main(ProcessRunner.java:253)

version and operating system

Data loader :dataloader-25.0.2-uber.jar
CLIQ : 2.2.0
OS:AIX duccaspshcm03 1 6 00F6F0844C00

JAVA:
java version "1.6.0"
Java(TM) SE Runtime Environment (build pap6460sr9fp1-20110208_03(SR9 FP1))
IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 AIX ppc64-64 jvmap6460sr9-20110203_74

I am not able to find out the error. Please reply if i need to do any changes in configuration when we move to AIX. Everything is working well in Solaris. Please help .