Cannot use bpws:getVariableData in dynamic assignment using xpath

Hello,
I'm trying to use dynamic task assignment using xpath expression. I have a BPEL variable (collection) that holds a list of users.
Under task assignment I set the following expression (data type- by expression):
bpws:getVariableData('Invoke1_get_usersSelect_OutputVariable','TestApprovalCollection','/ns5:TestApprovalCollection/ns5:TestApproval')
But when i run the process i get this error :
Function 'getVariableData' not found
Your help is appreciated.
Regards,

Make sure you have this entry in your bpel.
xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/"

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