Problem with IView Callable in GP

Hi Guys,
I encounter a similar problem to the one in thread Problem to execute a Callable Object in UWL iView doesn't work in my GP process at all. I always get the error message in GP Runtime when it comes to an iView callable: The portal page builder required to execute this callable object is not available.. If I open the corresponding task in UWL I get: "cannot get the process instance, please contact your system administrator.". The messages look familiar, but happen in a totally different situation.
I also get the modified config file, no help. So could any of you figure out what the problem is? Thanks.
Ge

try this uwl config file
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE UWLConfiguration PUBLIC '-//SAP//UWL1.0//EN' 'uwl_configuration.dtd' [
]>
<UWLConfiguration version="2.0">
<ItemTypes>
 <ItemType name="uwl.task.gp" connector="GuidedProceduresConnector" defaultView="uwlTaskGPView" defaultAction="launchGP" executionMode="default">
 <Actions>
 <Action name="launchGP" groupAction="no" handler="IViewLauncher" referenceBundle="launch_sap" returnToDetailViewAllowed="yes" launchInNewWindow="no" launchNewWindowName="GPWindow" launchNewWindowFeatures="resizable=yes,scrollbars=yes,status=yes,toolbar=no,menubar=no,location=no,directories=no">
 <Properties>
 <Property name="DynamicParameter" value="app.processId=${item.externalId}"/>
 <Property name="page" value="pcd:portal_content/com.sap.pct/platform_add_ons/com.sap.caf.eu.gp.folders.gp/com.sap.caf.eu.gp.roles.runtime/com.sap.caf.eu.gp.worksets.runtime/com.sap.caf.eu.gp.pages.procinstance"/>
 <Property name="app.processId" value="${item.externalId}"/>
 <Property name="System" value="SAP_LocalSystem"/>
 </Properties>
 </Action>
 </Actions>
 </ItemType>
</ItemTypes>
<Views>
 <View name="uwlTaskGPView" selectionMode="SINGLESELECT" width="98%" supportedItemTypes="uwl.task.gp" columnOrder="subject, process, creatorId, createdDate, dueDate, status" sortby="dueDate:ascend, createdDate:descend" tableDesign="STANDARD" visibleRowCount="10" headerVisible="no" queryRange="undefined" tableNavigationFooterVisible="yes" tableNavigationType="CUSTOMNAV" actionRef="" refresh="300" dueDateSevere="86400000" dueDateWarning="259200000" emphasizedItems="new" displayOnlyDefinedAttributes="yes" dynamicCreationAllowed="yes" actionPosition="bottom">
 <Descriptions default="Guided Procedures">
 <ShortDescriptions>
 <Description Language="de" Description="Guided Procedures"/>
 <Description Language="en" Description="Guided Procedures"/>
 </ShortDescriptions>
 </Descriptions>
 <DisplayAttributes>
 <DisplayAttribute name="phase" type="string" width="" sortable="yes" format="default" hAlign="LEFT" vAlign="BASELINE" maxTextWidth="0" headerVisible="yes">
 <Descriptions default="Phase">
 <ShortDescriptions>
 <Description Language="de" Description="Phase"/>
 <Description Language="en" Description="Phase"/>
 </ShortDescriptions>
 </Descriptions>
 </DisplayAttribute>
 <DisplayAttribute name="process" type="string" width="" sortable="yes" format="default" hAlign="LEFT" vAlign="BASELINE" maxTextWidth="0" headerVisible="yes">
 <Descriptions default="Process">
 <ShortDescriptions>
 <Description Language="de" Description="Process"/>
 <Description Language="en" Description="Process"/>
 </ShortDescriptions>
 </Descriptions>
 </DisplayAttribute>
 </DisplayAttributes>
 <Actions>
 <Action name="launchGP" groupAction="no" handler="IViewLauncher" referenceBundle="launch_sap" returnToDetailViewAllowed="yes" launchInNewWindow="no" launchNewWindowName="GPWindow" launchNewWindowFeatures="resizable=yes,scrollbars=yes,status=yes,toolbar=no,menubar=no,location=no,directories=no">
 <Properties>
 <Property name="DynamicParameter" value="app.processId=${item.externalId}"/>
 <Property name="page" value="pcd:portal_content/com.sap.pct/platform_add_ons/com.sap.caf.eu.gp.folders.gp/com.sap.caf.eu.gp.roles.runtime/com.sap.caf.eu.gp.worksets.runtime/com.sap.caf.eu.gp.pages.procinstance"/>
 <Property name="app.processId" value="${item.externalId}"/>
 <Property name="System" value="SAP_LocalSystem"/>
 </Properties>
 </Action>
 </Actions>
 </View>
</Views>
</UWLConfiguration>

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Log File:
[code]
Component : com.sap.portal.navigation.toolarea.default
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     at java.security.AccessController.doPrivileged(Native Method)
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Caused by: com.sapportals.portal.prt.core.broker.PortalComponentInstantiationException: Could not instantiate implementation class com.sapportals.portal.navigation.ToolAreaiView of Portal Component com.sap.portal.navigation.toolarea.default because: Could not find implementation class
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     at com.sapportals.portal.prt.core.broker.PortalComponentItem.getComponentInstance(PortalComponentItem.java:732)
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     at com.sapportals.portal.prt.component.PortalComponentContext.init(PortalComponentContext.java:242)
     ... 26 more
Caused by: java.lang.ClassNotFoundException: com.sapportals.portal.navigation.ToolAreaiView
Found in negative cache
Loader Info -
ClassLoader name: [com.sapportals.portal.prt.util.ApplicationClassLoader@2086d]
Parent loader name: [com.sapportals.portal.prt.util.ApplicationClassLoader@695f94]
References:
   not registered!
Resources:
   C:
usr
sap
J2E
JC00
j2ee
cluster
server0
apps
sap.com
irj
servlet_jsp
irj
root
WEB-INF
portal
portalapps
com.sap.portal.navigation.toolarea
private
classes
     at com.sap.engine.frame.core.load.ReferencedLoader.loadClass(ReferencedLoader.java:360)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
     at java.lang.Class.forName0(Native Method)
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     at com.sapportals.portal.prt.core.broker.PortalComponentItemFacade.getInstanceInternal(PortalComponentItemFacade.java:228)
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[/code]

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