java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
        at org.netbeans.modules.visualweb.insync.ModelSet.createInstance(ModelSet.java:269)
        at org.netbeans.modules.visualweb.insync.ModelSet.getInstance(ModelSet.java:250)
        at org.netbeans.modules.visualweb.insync.ModelSet$1.run(ModelSet.java:217)
        at java.lang.Thread.run(Thread.java:619)
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java:0)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.netbeans.modules.visualweb.insync.ModelSet.createInstance(ModelSet.java:265)
        at org.netbeans.modules.visualweb.insync.ModelSet.getInstance(ModelSet.java:250)
        at org.netbeans.modules.visualweb.insync.ModelSet$1.run(ModelSet.java:217)
        at java.lang.Thread.run(Thread.java:619)
java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.batik.css.engine.value.ListValue.append(Lorg/apache/batik/css/engine/value/Value;)V" the class loader (instance of org/netbeans/StandardModule$OneModuleClassLoader) of the current class, org/netbeans/modules/visualweb/designer/cssengine/BackgroundPositionManager, and the class loader (instance of org/netbeans/StandardModule$OneModuleClassLoader) for resolved class, org/apache/batik/css/engine/value/ListValue, have different Class objects for the type org/apache/batik/css/engine/value/Value used in the signature
        at org.netbeans.modules.visualweb.designer.cssengine.BackgroundPositionManager.<clinit>(BackgroundPositionManager.java:93)
        at org.netbeans.modules.visualweb.designer.cssengine.XhtmlCssEngine.<clinit>(XhtmlCssEngine.java:112)
        at org.netbeans.modules.visualweb.designer.cssengine.CssEngineServiceImpl.createCssEngineForDocument(CssEngineServiceImpl.java:163)
        at org.netbeans.modules.visualweb.insync.markup.MarkupUnit.syncEngine(MarkupUnit.java:599)
        at org.netbeans.modules.visualweb.insync.markup.MarkupUnit.read(MarkupUnit.java:523)
        at org.netbeans.modules.visualweb.insync.SourceUnit.sync(SourceUnit.java:552)
        at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.syncSubUnits(FacesPageUnit.java:257)
        at org.netbeans.modules.visualweb.insync.beans.BeansUnit.sync(BeansUnit.java:205)
        at org.netbeans.modules.visualweb.insync.live.LiveUnitWrapper.sync(LiveUnitWrapper.java:152)
        at org.netbeans.modules.visualweb.insync.models.FacesModel.syncImpl(FacesModel.java:1091)
        at org.netbeans.modules.visualweb.insync.Model.sync(Model.java:219)
        at org.netbeans.modules.visualweb.insync.ModelSet.syncAll(ModelSet.java:752)
        at org.netbeans.modules.visualweb.insync.models.FacesModelSet.syncAll(FacesModelSet.java:1486)
        at org.netbeans.modules.visualweb.insync.models.FacesModelSet.doModeling(FacesModelSet.java:537)
        at org.netbeans.modules.visualweb.insync.models.FacesModelSet.<init>(FacesModelSet.java:422)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java:0)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.netbeans.modules.visualweb.insync.ModelSet.createInstance(ModelSet.java:265)
        at org.netbeans.modules.visualweb.insync.ModelSet.getInstance(ModelSet.java:250)
        at org.netbeans.modules.visualweb.insync.ModelSet$1.run(ModelSet.java:217)
        at java.lang.Thread.run(Thread.java:619)