Create AR Statement error

 at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at System.Nullable`1.get_Value() at PX.Objects.AR.StatementCycleProcessBO.AccumulateAgeBalances(PXGraph graph, ARStatementCycle statementCycle, ARStatement statement, ARRegister document, Boolean ageCredits) at PX.Objects.AR.StatementCycleProcessBO.AccumulateAgeBalancesIntoStatements(ARStatementCycle statementCycle, DateTime statementDate, IEnumerable`1 openDocuments, IDictionary`2 statements, Boolean ageCredits) at PX.Objects.AR.StatementCycleProcessBO.GenerateCustomerStatement(ARStatementCycle statementCycle, Customer customer, DateTime statementDate, IDictionary`2 familyStatements, IDictionary`2 familyStatementDetails, IDictionary`2 deletedFamilyStatementsTrace, Boolean isOnDemand) at PX.Objects.AR.StatementCycleProcessBO.GenerateStatementForCustomerFamily(StatementCreateBO persistGraph, ARStatementCycle statementCycle, IEnumerable`1 customerFamily, DateTime statementDate, Boolean clearExisting, Boolean isOnDemand) at PX.Objects.AR.StatementCycleProcessBO.GenerateStatement(ARStatementCycle cycle, DateTime statementDate) at PX.Objects.AR.StatementCycleProcessBO.ProcessCycles(StatementCycleProcessBO graph, ARStatementCycle aCycle) at PX.Data.PXProcessingBase`1.<>c__DisplayClass98_0`1.<SetProcessDelegate>b__1(Graph g, Table r, CancellationToken _) at PX.Data.PXProcessing.<>c__DisplayClass9_0`2.<ProcessItem>b__0(TTable item, CancellationToken itemCancellationToken) at PX.Data.PXProcessing.ProcessItem[TTable](List`1 list, Int32 i, Action`2 action, PXProcessingInfo`1 info, CancellationToken cancellationToken)