Installing 11.2.0 Client on Redhat Linux

Hi!

The following message appears when running the Oracle 11.2.0 Client, 32-Bit (Administrator version) installer on Redhat Enterprise Edition (64-Bit) as Oracle user:

Exception in thread "main" java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at java.awt.Toolkit$2.run(Toolkit.java:821)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:804)
at com.jgoodies.looks.LookUtils.isLowResolution(Unknown Source)
at com.jgoodies.looks.LookUtils.(Unknown Source)
at com.jgoodies.looks.plastic.PlasticLookAndFeel.(PlasticLookAndFeel.java:122)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1783)
at javax.swing.UIManager.setLookAndFeel(UIManager.java:480)
at oracle.install.commons.util.Application.startup(Application.java:758)
at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:164)
at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:181)
at oracle.install.commons.base.driver.common.Installer.startup(Installer.java:265)
at oracle.install.ivw.client.driver.ClientInstaller.startup(ClientInstaller.java:85)
at oracle.install.ivw.client.driver.ClientInstaller.main(ClientInstaller.java:95)

SCHWERWIEGEND: [FATAL] [INS-00001] Unbekannter nicht behebbarer Fehler

Redhat version: 4.1.2-41 (x86-64)
Linux version: 2.6.18-92.e15

What could the cause be?