java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at com.telelogic.rhapsody.core.JavaPluginsManager.callStringPluginMethod(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
	at java.lang.reflect.Method.invoke(Method.java:508)
	... 1 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/swt/widgets/MessageBox
	at com.ibm.rhapsody.sysML.RPUnitTools.showMessageBox(RPUnitTools.java:34)
	at com.ibm.rhapsody.sysML.RPUnitTools.getCheckedOutElement(RPUnitTools.java:68)
	at com.ibm.rhapsody.sysML.CreateUpdateDirectionFlows.CreateUpdateFlows(CreateUpdateDirectionFlows.java:141)
	at com.ibm.rhapsody.sysML.SysMLPlugin.OnMenuItemSelect(SysMLPlugin.java:33)
	... 5 more