Script does not work in soapUI 4.5

Thu Apr 12 13:57:22 CEST 2012:ERROR:java.lang.ArrayIndexOutOfBoundsException: -1
java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(Unknown Source)
at java.util.ArrayList.remove(Unknown Source)
at com.eviware.soapui.model.environment.EnvironmentImpl.removeProperty(SourceFile:320)
at com.eviware.soapui.model.environment.EnvironmentImpl.removePropertyByName(SourceFile:351)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro$InternalTestPropertyListener.propertyRemoved(SourceFile:786)
at com.eviware.soapui.impl.wsdl.support.XmlBeansPropertiesTestPropertyHolder.firePropertyRemoved(XmlBeansPropertiesTestPropertyHolder.java:136)
at com.eviware.soapui.impl.wsdl.support.XmlBeansPropertiesTestPropertyHolder.removeProperty(XmlBeansPropertiesTestPropertyHolder.java:219)
at com.eviware.soapui.impl.wsdl.AbstractTestPropertyHolderWsdlModelItem.removeProperty(AbstractTestPropertyHolderWsdlModelItem.java:124)
at com.eviware.soapui.impl.wsdl.MutableTestPropertyHolder$removeProperty.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at Script1.removeProperties(Script1.groovy:37) ==> project.removeProperty(project.getPropertyAt(i).name);
at Script1.run(Script1.groovy:27)
at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:96)
at com.eviware.soapui.support.scripting.groovy.SoapUIProGroovyScriptEngineFactory$SoapUIProGroovyScriptEngine.run(SourceFile:89)
at com.eviware.soapui.impl.wsdl.WsdlProject.runBeforeSaveScript(WsdlProject.java:1519)
at com.eviware.soapui.impl.wsdl.WsdlProject.beforeSave(WsdlProject.java:911)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.beforeSave(SourceFile:370)
at com.eviware.soapui.impl.wsdl.WsdlProject.saveIn(WsdlProject.java:768)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.saveIn(SourceFile:363)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.save(SourceFile:438)
at com.eviware.soapui.impl.wsdl.actions.project.SaveProjectAction.perform(SaveProjectAction.java:42)
at com.eviware.soapui.impl.wsdl.actions.project.SaveProjectAction.perform(SaveProjectAction.java:28)
at com.eviware.soapui.support.action.swing.SwingActionDelegate.actionPerformed(SwingActionDelegate.java:89)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(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.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.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)

On a side node, the log also shows the following error:
Thu Apr 12 13:57:23 CEST 2012:WARN:Failed to delete temporary project file; C:\Workspace\Testen\###\soapUI\project-temp-3894800989267663626.xml