Question : syntax error converting datetime from character string

I am getting the error syntax error converting datetime from character string. I believe I need to use cast but cannot get the syntax correct. I could use some help

SELECT
tbl_CHC_PPO_VFR.PPO_VFR_KEY,
tbl_CHC_PPO_VFR.CBH_Vendor_Name,
tbl_CHC_PPO_VFR.Vendor,
tbl_CHC_PPO_VFR.FileType,
Year([Cycle_Date]) & CASE WHEN Len(Month([Cycle_Date]))=1 THEN '0' & Month([Cycle_Date]) ELSE Month([Cycle_Date]) END AS CHCCyclePeriod,
tbl_CHC_PPO_VFR.Account_Number,
tbl_CHC_PPO_VFR.Branch_Number,
tbl_CHC_PPO_VFR.Ben_Opt,
CASE WHEN [Eft_Date] Is Null THEN 'blank' ELSE [Eft_Date] END AS EftDate,
'blank' AS CoveragePeriod,
'blank' AS State_Abr,
tbl_CHC_PPO_VFR.Product,
Tbl_CHC_Products.Line_Of_Business AS LOB,
tbl_CHC_PPO_VFR.Dollar_Amt,
tbl_CHC_PPO_VFR.Pending,
CASE WHEN [Alliance_Ind] Is Null THEN 'blank' ELSE [Alliance_Ind] END AS AllianceInd,
CASE WHEN [Parent_Network_ID] Is Null THEN 'blank' ELSE [Parent_Network_ID] END AS ParentNetworkID,
CASE WHEN [Mem_Network_ID] Is Null THEN 'blank' ELSE [Mem_Network_ID] END AS MemNetworkID,
CASE WHEN [Coord_Party_ID] Is Null THEN 'blank' ELSE [Coord_Party_ID] END AS CoordPartyID,
tbl_CHC_PPO_VFR.File_Date,
CASE WHEN [ManualAdjustment] Is Null THEN 'No'ELSE [ManualAdjustment] END AS ManualAdjust,
tbl_CHC_PPO_VFR.AdjustmentNote,
oapr_tbl_VFR_Payment_Period_Conversion.PaymentPeriod,
tbl_CHC_PPO_VFR.ClaimRefund,
oapr_tbl_VFR_Payment_Period_Conversion.PendFile
FROM ((oapr_tbl_VFR_Payment_Period_Conversion
INNER JOIN tbl_CHC_PPO_VFR
ON oapr_tbl_VFR_Payment_Period_Conversion.File_Date = tbl_CHC_PPO_VFR.File_Date)
INNER JOIN oapr_tbl_Current_Period
ON oapr_tbl_VFR_Payment_Period_Conversion.PaymentPeriod = oapr_tbl_Current_Period.CurrentPeriod)
INNER JOIN Tbl_CHC_Products
ON tbl_CHC_PPO_VFR.Product = Tbl_CHC_Products.Product_Cd
WHERE (((tbl_CHC_PPO_VFR.Pending)='Y')
AND ((tbl_CHC_PPO_VFR.ClaimRefund)='No')
AND ((oapr_tbl_VFR_Payment_Period_Conversion.PendFile)='PendFile'));

Answer : syntax error converting datetime from character string

are there any null values in that field?