Error in syntax but there is no message to say where the error is.

[KimSharp]

Pick( _%TransactionType
, $(expFilteredPlannedReceiptQty)
, $(expFilteredMaterialRequirementQty)
, Null()
)

This is the code.  I attached a screenshot of the error.  The variables don't seem to have any errors.

expFilteredPlannedReceiptQty = Sum({<[_GeneratedRow]={0},%MRPTransactionType={1},%MRPOrderType={"*"}-{"$(vIncludeMRPOrders)"},[MRP Transaction Date]={"<$(vMaxTransactionDate)"}>} [MRP Movement Qty])

expFilteredMaterialRequirementQty = Sum({<[_GeneratedRow]={0},%MRPTransactionType={2},[MRP Transaction Date]={"<$(vMaxTransactionDate)"}>} [MRP Movement Qty])

Can anyone tell me what's wrong with the syntax here?