java language error

                             java error
Error message:
Exception in thread "main" java.lang.IncompatibleClassChangeError

at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.process(ValidatorImpl.java:187)

at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:159)

at javax.xml.validation.Validator.validate(Validator.java:82)
 at oracle.install.commons.util.XmlSupport.validate(XmlSupport.java:107)
 at oracle.install.commons.util.XmlSupport.validate(XmlSupport.java:127)
 at oracle.install.commons.util.Application.startup(Application.java:674)
 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.demos.driver.DemosInstaller.startup(DemosInstaller.java:89)
 at oracle.install.ivw.demos.driver.DemosInstaller.main(DemosInstaller.java:99)

Solution:
[root@localhost ~]# rm -rf /tmp/*