Sql query (subquery returned more than 1 value..)

<pre>ALTER PROCEDURE [dbo].[SpWeighTicketReport]
@WeighTicketCode VARCHAR(50) = '',
@StartDate AS SMALLDATETIME = NULL,
@EndDate AS SMALLDATETIME = NULL,
@StrSearch AS VARCHAR(2000) = NULL
AS
SET NOCOUNT ON
DECLARE @StrQuery VARCHAR(8000) = ''
BEGIN
	SET @StrQuery = 'SELECT 
					 (SELECT CompanyName FROM CompanyMaster) AS CompanyName, WeighTicketCode, 
					 VehicleCode, CustomerName, ProductCode, ProductName, TransporterName, ContractNo, DONo, 
					 PL3No, TransactionNote, DriverName, ModifyBy AS WeighBy, WeighDate1, WeighDate2, 
					 Weigh1, R1, Weigh2, R2, FFA, Mouisture, Dirt, Broken,
					 (CASE WHEN R1 > Weigh1 THEN R1 - Weigh1 ELSE Weigh1 - R1 END) AS V1, 
					 (CASE WHEN R2 > Weigh2 THEN R2 - Weigh2 ELSE Weigh2 - R2 END) AS V2,
					 (CASE WHEN Weigh1 > Weigh2 THEN Weigh1 - Weigh2 ELSE Weigh2 - Weigh1 END) AS Netto, 
					 (CASE WHEN R1 > R2 THEN R1 - R2 ELSE R2 - R1 END) AS RNetto,
					 (CASE WHEN R1 > R2 THEN R1 - R2 ELSE R2 - R1 END) 
					 - 
					 (CASE WHEN Weigh1 > Weigh2 THEN Weigh1 - Weigh2 ELSE Weigh2 - Weigh1 END) AS VNetto,
					 AdjustWeigh, WeighNet, UOM1, Ext, Potongan, 
					 ' + QUOTENAME(CONVERT(VARCHAR, ISNULL(@StartDate, GETDATE()), 106) + ' s.d. ' + CONVERT(VARCHAR, ISNULL(@EndDate, GETDATE()), 106), '''') + ' AS Periode 
					 FROM 
					 VWeighTicket '			 
	IF LEN(@WeighTicketCode) > 0
		BEGIN
			SET @StrQuery = @StrQuery + ' WHERE WeighTicketCode = ' + QUOTENAME(@WeighTicketCode, '''') 
		END
	ELSE IF LEN(@StrSearch) > 0
		BEGIN
			SET @StrQuery = @StrQuery + ' ' + @StrSearch + ' AND CONVERT(VARCHAR, WeighDate1, 112) BETWEEN CONVERT(VARCHAR, CAST(' + QUOTENAME(@StartDate, '''') + ' AS DATE), 112) AND CONVERT(VARCHAR, CAST(' + QUOTENAME(@EndDate, '''') + ' AS DATE), 112) '
		END      
	ELSE
		BEGIN
			SET @StrQuery = @StrQuery + ' WHERE CONVERT(VARCHAR, WeighDate1, 112) BETWEEN CONVERT(VARCHAR, CAST(' + QUOTENAME(@StartDate, '''') + ' AS DATE), 112) AND CONVERT(VARCHAR, CAST(' + QUOTENAME(@EndDate, '''') + ' AS DATE), 112) '
		END
	SET	@StrQuery = @StrQuery + ' ORDER BY ID ASC'
END
EXEC (@StrQuery)

Subquery returned more than 1 value...