[flexcoders] DataServiceException

[Geoffrey]

I'm trying to create a DataServiceTransaction to push an update out to
my DataService clients.  I'm getting the below error when it tries to
create the DataServiceTransaction.

flex.data.DataServiceException: Unable to access UserTransaction in
DataService.
  at
flex.data.DataServiceTransaction.doBegin(DataServiceTransaction.java:855)
  at
flex.data.DataServiceTransaction.begin(DataServiceTransaction.java:807)
  at
flex.data.DataServiceTransaction.begin(DataServiceTransaction.java:270)
  at
flex.data.DataServiceTransaction.begin(DataServiceTransaction.java:283)
...


My code is:
DataServiceTransaction dst = DataServiceTransaction.begin(true);
dst.refreshFill("myTasks", null);
dst.commit();


Any ideas?
 Geoff