Function Error (newbie)

eh guys ma kind of newbie n tis ... k like wrote a function like

CREATE FUNCTION [dbo].[GetDetailText]
{
@PackingID int,
@PackingType int
}
RETURNS varchar(100)


AS

BEGIN

DECLARE @DetailText varchar(100)

IF (@PackingType = 1)
BEGIN


SET @DetailText = (SELECT
'Tickness' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.thickness) + '' + CONVERT(varchar, KF_Unit_3.Symbol)
+ ',' + 'Width' + ': ' + CONVERT(varchar, dbo.KF_PackMaterial.width) + '' + CONVERT(varchar, KF_Unit_1.Symbol)
+ ',' + 'InnerDia' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.india) + '' + CONVERT(varchar, KF_Unit_5.Symbol)
+ ',' + 'OuterDia' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.outdia) + '' + CONVERT(varchar, KF_Unit_6.Symbol)
+ ',' + 'Recycle' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.recycle) + ', ' + 'Shade' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.shade)
+ ',' + 'Weight' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.weight) + '' + CONVERT(varchar, KF_Unit_4.Symbol)
+ ',' + 'Perforation' + ':' + CONVERT(varchar, dbo.KF_PackMaterial.perforation) + ' (' + CONVERT(varchar, dbo.KF_PackingMaterial.PackingTypeName)
+ ')'
FROM dbo.KF_CartonImageList RIGHT OUTER JOIN
dbo.KF_PackMaterial INNER JOIN
dbo.KF_PackType ON dbo.KF_PackMaterial.type = dbo.KF_PackType.PackID INNER JOIN
dbo.KF_Unit KF_Unit_1 ON dbo.KF_PackMaterial.widthunit = KF_Unit_1.UnitID INNER JOIN
dbo.KF_PackingMaterial ON dbo.KF_PackMaterial.packmaterialid = dbo.KF_PackingMaterial.Packingid LEFT OUTER JOIN
dbo.KF_Color ON dbo.KF_PackMaterial.ColorId = dbo.KF_Color.ColorId LEFT OUTER JOIN
dbo.KF_Unit KF_Unit_6 ON dbo.KF_PackMaterial.outdiaunit = KF_Unit_6.UnitID LEFT OUTER JOIN
dbo.KF_Unit KF_Unit_5 ON dbo.KF_PackMaterial.indiaunit = KF_Unit_5.UnitID LEFT OUTER JOIN
dbo.KF_Unit KF_Unit_4 ON dbo.KF_PackMaterial.weightunit = KF_Unit_4.UnitID LEFT OUTER JOIN
dbo.KF_Unit KF_Unit_3 ON dbo.KF_PackMaterial.thicknessunit = KF_Unit_3.UnitID LEFT OUTER JOIN
dbo.KF_Unit KF_Unit_2 ON dbo.KF_PackMaterial.lengthunit = KF_Unit_2.UnitID LEFT OUTER JOIN
dbo.KF_Unit KF_Unit_7 ON dbo.KF_PackMaterial.heightunit = KF_Unit_7.UnitID ON
dbo.KF_CartonImageList.CDImageId = dbo.KF_PackMaterial.CDImageId
WHERE (dbo.KF_PackMaterial.id=@PackingID AND dbo.KF_PackMaterial.packmaterialid=@PackingType))
END

return @DetailText
END


buts its throwing syntax error like
"[Microsoft][ODBC SQL Server Driver]Syntax error or access violation
"

... ne idea ????????