RapidWiz fails at 00020

Hi,
During installation or oracle ebs 11.5.10.2 on solaris ,rapidwiz fails at 00020 as below.

# RW-00020: Error: - Invalid configuration file. Incorrect value for MOUNT_SIZE for platform Intel_Solaris
java.lang.NullPointerException
       at oracle.apps.ad.rapidwiz.PreCheckPanel.ReInitControls(PreCheckPanel.java:247)
       at oracle.apps.ad.rapidwiz.GenericControlPanel.ReInitControlsAndHelp(GenericControlPanel.java:348)
       at oracle.apps.ad.rapidwiz.RIWizard.wizardSelectionChanged(RIWizard.java:2169)
       at oracle.ewt.wizard.BaseWizard.processWizardEvent(Unknown Source)
       at oracle.ewt.wizard.BaseWizard.processEventImpl(Unknown Source)
       at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
       at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
       at oracle.ewt.wizard.BaseWizard.selectPage(Unknown Source)
       at oracle.ewt.wizard.BaseWizard.selectPage(Unknown Source)