Error when trying to view rest methods

I am now getting an error when trying to view rest methods that where previously working.

Thu Sep 05 09:18:09 BST 2013:ERROR:An error occured [java.lang.NullPointerException], see error log for details

Thu Sep 05 09:18:26 BST 2013:ERROR:java.lang.NullPointerException
java.lang.NullPointerException
at com.eviware.soapui.impl.support.EndpointSupportPro.getRequestEndpoint(SourceFile:79)
at com.eviware.soapui.impl.support.EndpointsComboBoxModelPro.initEndpoints(SourceFile:20)
at com.eviware.soapui.impl.support.EndpointsComboBoxModel.<init>(EndpointsComboBoxModel.java:48)
at com.eviware.soapui.impl.support.EndpointsComboBoxModelPro.<init>(SourceFile:14)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestDesktopPanel.setEndpointsModel(SourceFile:103)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestDesktopPanel.setEndpointsModel(SourceFile:35)
at com.eviware.soapui.impl.support.panels.AbstractHttpRequestDesktopPanel.init(AbstractHttpRequestDesktopPanel.java:135)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestDesktopPanel.init(SourceFile:97)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestDesktopPanel.init(SourceFile:35)
at com.eviware.soapui.impl.support.panels.AbstractHttpRequestDesktopPanel.<init>(AbstractHttpRequestDesktopPanel.java:112)
at com.eviware.soapui.impl.support.panels.AbstractHttpXmlRequestDesktopPanel.<init>(AbstractHttpXmlRequestDesktopPanel.java:31)
at com.eviware.soapui.impl.rest.panels.request.AbstractRestRequestDesktopPanel.<init>(AbstractRestRequestDesktopPanel.java:67)
at com.eviware.soapui.impl.wsdl.panels.teststeps.RestTestRequestDesktopPanel.<init>(RestTestRequestDesktopPanel.java:67)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestDesktopPanel.<init>(SourceFile:43)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestStepPanelBuilder.buildDesktopPanel(SourceFile:18)
at com.eviware.soapui.impl.wsdl.panels.teststeps.ProRestTestRequestStepPanelBuilder.buildDesktopPanel(SourceFile:13)
at com.eviware.soapui.ui.desktop.standalone.StandaloneDesktop.showDesktopPanel(StandaloneDesktop.java:184)
at com.eviware.soapui.support.UISupport.showDesktopPanel(UISupport.java:590)
at com.eviware.soapui.support.UISupport.selectAndShow(UISupport.java:578)
at com.eviware.soapui.impl.wsdl.actions.support.ShowDesktopPanelAction.perform(ShowDesktopPanelAction.java:53)
at com.eviware.soapui.support.action.swing.SwingActionDelegate.actionPerformed(SwingActionDelegate.java:89)
at com.eviware.soapui.support.action.swing.DefaultActionList.performDefaultAction(DefaultActionList.java:107)
at com.eviware.soapui.ui.Navigator$TreeMouseListener$1.run(Navigator.java:408)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

I am using soapui pro 4.5.2 with a trial licence