conversion of a varchar data type to a datetime data type resulted in an out-of-range value

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C#

SQL-Server

Visual-Studio

i am getting this error when trying to view a selected request.
ALTER PROC [dbo].[Proc_View_Exp_Req_Detail] --934
@Exp_Requisition_Id INT
AS
BEGIN
SET NOCOUNT ON;
SELECT D.Exp_Detail_id
,CASE(D.Working_Type)
WHEN 1 THEN 'Working In HQ'
WHEN 2 THEN 'Working In Ex-HQ'
End AS 'Working_Type'
,ER.EXP_REQUISITION_ID
,D.Expense_Head_Id
,EH.EXPENSE_HEAD AS 'ExpenseHead'
,D.With_Bill AS 'WithBill'

,C1.City_Name AS 'FromLocation'
,C2.City_Name AS 'ToLocation'
,CASE(D.Expense_Head_Id) WHEN 12 THEN (CONVERT(VARCHAR(11),D.From_Date,103)+' '+COALESCE(Start_Time,'') +' - ' + COALESCE(End_Time,''))
ELSE (CONVERT(VARCHAR(11),D.From_Date,103)+' '+COALESCE(Start_Time,''))
END AS 'FromDate'

,(CONVERT(VARCHAR(11),D.To_Date,103)+' '+COALESCE(End_Time,'')) AS 'ToDate'
,TM.MODE_DETAIL AS 'ModeOfTravel',TC.CLASS_DETAIL AS'ClassOfTravel'
,D.KM,D.Bill_Number AS 'BillNo'
,D.Total_Amount AS 'Actual_Amount'
,D.Cleared_Amount AS 'Approved_Amount'
,D.OPE,
D.Remarks
,(SELECT SUM(A.OPE) FROM EXPENSE_REQUISITION_DETAIL A WHERE A.Exp_Requisition_Id = ER.EXP_REQUISITION_ID) AS 'TOTAL_OPE'
,(SELECT SUM(A.Cleared_OPE) FROM EXPENSE_REQUISITION_DETAIL A WHERE A.Exp_Requisition_Id = ER.EXP_REQUISITION_ID) AS 'TOTAL_APPROVED_OPE'
,CASE(D.Is_Canceled)
WHEN 'TRUE' THEN 'Yes'
ELSE 'No'
END AS 'Is_Canceled'
,D.Cleared_Amount
,D.Cleared_OPE AS 'APPROVED_OPE'
,(SELECT SUM(Cleared_Amount) FROM EXPENSE_REQUISITION_DETAIL
WHERE Exp_Requisition_Id = @Exp_Requisition_Id) AS 'APPROVED_AMOUNT_SUM'
,(SELECT SUM(Total_Amount) FROM EXPENSE_REQUISITION_DETAIL
WHERE Exp_Requisition_Id = @Exp_Requisition_Id) AS 'ACTUAL_AMOUNT_SUM'
,D.IsSpecialRequisition
,(SELECT TOP 1 'Y' FROM Exp_Requistion_Amount_Tracking WHERE exp_requisition_id = ER.EXP_REQUISITION_ID AND Exp_Detail_id = D.Exp_Detail_id AND LEN(Remarks)>0) AS 'IsHaveRemarks'
FROM EXPENSE_REQUISITION ER JOIN EXPENSE_REQUISITION_DETAIL D
ON ER.EXP_REQUISITION_ID = D.Exp_Requisition_Id
JOIN EXPENSE_HEAD EH
ON EH.EXPENSE_HEAD_ID = D.Expense_Head_Id
JOIN City_Master C1
ON C1.City_Id = D.From_Location_Id
LEFT JOIN City_Master C2
ON C2.City_Id = D.To_Location_Id

LEFT JOIN TRANSPORT_MODE TM
ON TM.MODE_ID = D.Mode_Id
LEFT JOIN TRAVEL_CLASS TC
ON TC.CLASS_ID = D.Class_Id
WHERE ER.Exp_Requisition_Id = @Exp_Requisition_Id
ORDER BY D.From_Date ,convert(char(5),cast(Start_Time as datetime),108)
-- ORDER BY FromDate
END

i am getting this error
"

C#

[SqlException (0x80131904): The conversion of a varchar data type to a datetime data type resulted in an out-of-range value.]
   Requisition_ViewExpenseRequisition.ReadExpenseHeadDetail(String expRequisitionId) in d:\\Requisition\ViewExpenseRequisition.aspx.cs:170
   Requisition_ViewExpenseRequisition.Page_Load(Object sender, EventArgs e) in d:\\Requisition\ViewExpenseRequisition.aspx.cs:28
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178

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