Dynamically Assigning Users to Participants

I'm trying to use the ArbitraryExpressionPerformer.
 
Here is what I've done so far:
 
1. Created a process and defined two activities.  Both of these
activities are in the "default" ArbitraryExpression "swimlane"
2. Created two process variables under JAWE's Workflow RelevantData tab
called "pone" and "ptwo" - both are Basic Type - String
3. Under JAWE's activities tab, I assigned pone to be the performer of
activityone and ptwo to be the performer of activitytwo
4. The script type for the package properties is set to text/javascript
5. I changed the Shark.conf file as follows, commenting out the default
and adding the new one:
#AssignmentManagerClassName=org.enhydra.shark.assignment.StandardAssignm
entManager 

 
AssignmentManagerClassName=org.enhydra.shark.assignment.XPDLStraightPart
icipantMappingAssignmentManager

6. I create the process and assign the process variable pone to
"UserOne" and ptwo to "UserTwo".
7. I start the process
 
If I look in the database, a resource of "UserOne" has indeed been
created for the first activity.  But that resource doesn't seem to be
connected to the user called "UserOne".  If I look at UserOne in the
admin tool, using they have no tasks.
 
My server is throwing a "Expression can not be evaluated" error - is
there something I missed in trying to use the
ArbitraryExpressionPerformer???    I've looked through the archives and
managed to figure out these steps, but found no information that would
indicate what the problem is.
 
Thanks for your time,
Greg
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