How to write a reusable script Library

Hi,
I use this reusuable script logic and was able to run in SoapUI 4.5.2 free version. But the same project (with the same scripts) is not running in SoapUI Pro 4.6.4 licensed version. Below is my script structure.

Project A
---Test Suite 1
------Test Case 1
----------(in the setupscript i have a code to call and run my common class method in another project as below)

library = testRunner.getTestCase().getTestSuite().getProject().getWorkspace().getProjectByName("Library")
suitename = library.getTestSuiteByName("Driver_Scripts");
module1 = suitename.testCases["Methods"].testSteps["Initialize_DataSetup"]
module1.run(testRunner, context)
def startTestData = context.InitializeTestData
startTestData.FirstData(<with some parameters>)

My Library project looks like below.

Library
---Driver_Scripts
------Methods
---------(here i have the 'Initialize_DataSetup' test case)

when i run the same script in SoapUI Pro 4.6.4, i get the below error. Could any one please help me to resolve.

Thu Jan 30 10:46:39 EST 2014:ERROR:java.lang.NullPointerException
java.lang.NullPointerException
at com.eviware.soapui.support.log.InspectorLog4JMonitor.getLogArea(InspectorLog4JMonitor.java:91)
at com.eviware.soapui.support.log.Log4JMonitor$getLogArea.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at InitializeTestData.FirstData(Script1.groovy:27)
at InitializeTestData$FirstData.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at Script9.run(Script9.groovy:50)
at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:96)
at com.eviware.soapui.support.scripting.groovy.SoapUIProGroovyScriptEngineFactory$SoapUIProGroovyScriptEngine.run(SourceFile:89)
at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCase.runSetupScript(WsdlTestCase.java:934)
at com.eviware.soapui.impl.wsdl.panels.testcase.WsdlTestCaseDesktopPanel$SetupScriptGroovyEditorModel$1.actionPerformed(WsdlTestCaseDesktopPanel.java:640)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.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.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(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.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)