SOAP UI issue

Hi,
I am using SOAP UI 4.5.1.I am unable to load the wsdl file in the SOAPUI project and getting the following exception.Please advise.


Mon Oct 28 16:40:47 IST 2013:ERROR:com.eviware.soapui.impl.support.definition.support.InvalidDefinitionException
com.eviware.soapui.impl.support.definition.support.InvalidDefinitionException
at com.eviware.soapui.impl.wsdl.support.wsdl.WsdlLoader.loadXmlObject(WsdlLoader.java:138)
at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.getDefinitionParts(SchemaUtils.java:535)
at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.selectDefinitionParts(SchemaUtils.java:565)
at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.getDefinitionParts(SchemaUtils.java:545)
at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.selectDefinitionParts(SchemaUtils.java:565)
at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.getDefinitionParts(SchemaUtils.java:547)
at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.getDefinitionParts(SchemaUtils.java:524)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionCache.update(AbstractDefinitionCache.java:97)
at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext$Loader.construct(AbstractDefinitionContext.java:226)
at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:46)
at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:149)
at java.lang.Thread.run(Unknown Source)


Thanks
Ananth