Error in vendor settlement

Hi,

while doing vendor settlement below error showing in AX 2009.

Message (12:01:29)
Processing item failed: Object reference not set to an instance of an object… Details: Object reference not set to an instance of an object. System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Dynamics365.Tax.Core.TaxEngineTaxJournalObject.journalLines()
at Microsoft.Dynamics365.Tax.Core.Runtime.TaxJournalAccountingProcessor.process()
at Microsoft.Dynamics365.Tax.Core.TaxEngine.calculate(ITaxableDocument _taxableDocument, TaxEngineCalculationParameter _processorParameter)

Looks like your AX 2009 application has GST installed. If so, is your code properly compiled and properly code merged?