FIRST PROJECT,PLEASE I NEED HELP

I am on my first Project .can you please help me with this query as I am not able to insert values.I have a dead line tomorrow and I am nervous.the Script and the Error is below



Requirement:
Pass in iftno,TherapeuticAreaid(TAID) to update backend with selected TherapeuticArea(TA)


INSERT INTO TherapeuticArea(TherapeuticAreaid,TherapeuticAreadescription)
values(3,'cancer')


Msg 544, Level 16, State 1, Line 1
Cannot insert explicit value for identity column in table 'TherapeuticArea' when IDENTITY_INSERT is set to OFF.


SCRIPT AND SP

/****** Object: Table [dbo].[TherapeuticArea] Script Date: 03/15/2008 21:27:16 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[TherapeuticArea]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[TherapeuticArea](
[TherapeuticAreaID] [int] IDENTITY(1,1) NOT NULL,
[TherapeuticAreaDescription] [nvarchar](50) NOT NULL,
[IndicationID] [int] NOT NULL,
CONSTRAINT [PK_TherapeuticArea] PRIMARY KEY CLUSTERED
(
[TherapeuticAreaID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
END
GO



ABLE 2
/****** Object: Table [dbo].[iftTherapeuticArea] Script Date: 03/15/2008 21:27:16 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[iftTherapeuticArea]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[iftTherapeuticArea](
[IFTID] [int] NOT NULL,
[TherapeuticAreaID] [int] NOT NULL,
[IsPrimary] [bit] NOT NULL
) ON [PRIMARY]
END
GO
IF NOT EXISTS (SELECT * FROM ::fn_listextendedproperty(N'MS_Description' , N'SCHEMA',N'dbo', N'TABLE',N'iftTherapeuticArea', N'COLUMN',N'IsPrimary'))
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'Indicates whether this is the Primary TherapeuticArea for the IFT, or is a secondary (Other) TherapeuticArea. A value of True (1) will indicate that this is the Primary TherapeuticArea, while a value of False (0) indicates that this is a secondary (Other) TherapeuticArea. There must be exactly one Primary TherapeuticArea per IFT, though there can be zero or more Secondary TherapeuticArea.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'iftTherapeuticArea', @level2type=N'COLUMN',@level2name=N'IsPrimary'
GO
IF NOT EXISTS (SELECT * FROM ::fn_listextendedproperty(N'MS_Description' , N'SCHEMA',N'dbo', N'TABLE',N'iftTherapeuticArea', NULL,NULL))
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'Contains all of the TherapeuticAreas associated with a given IFT (IFTBase).' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'iftTherapeuticArea'


STOREDpROCEDURE

USE [IFT_test]
GO
/****** Object: StoredProcedure [dbo].[Upd_TherapeuticArea] Script Date: 03/18/2008 14:00:11 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:Manjula Tadigiri

-- Create date: 03/16/2008
-- Description:Pass in iftno,TAID to update backend with selected TA
-- Tables Used: TherapeuticArea,IftTherapeuticArea
-- =============================================
CREATE PROCEDURE [dbo].[Upd_TherapeuticArea]

@IFTno bigint = 0,
@TherapeuticAreaId int = 0,
@TherapeuticAreaDescription nvarchar(50)='0'
AS
DECLARE @err int,@tablename sysname,@errormessage nvarchar(2000),@Desc
as char(85)

if exists (select 1 from TherapeuticArea as TA
Inner Join iftTherapeuticArea As IftTA On TA.TherapeuticAreaId=IftTa.TherapeuticAreaId
Where IftTA.IFTID=@iftno
and TA.TherapeuticAreaId=@TherapeuticAreaId)

BEGIN
BEGIN TRY
begin transaction
select @errormessage = 'update TherapeuticAreadescription
Failed',@tablename =
'TherapeuticArea'
UPDATE TherapeuticArea
SET TherapeuticAreadescription =@TherapeuticAreaDescription
FROM TherapeuticArea TA, iftTherapeuticArea ifta
WHERE TA.TherapeuticAreaId=ifta.TherapeuticAreaID
AND Ifta.IFTID=@iftno
And TA.TherapeuticAreaId=@TherapeuticAreaId


if @@ROWCOUNT=0
BEGIN
insert
dbo.Application_Error_Log(UserName,tablename,errorNumber,

errorSeverity,errorState,errorMessage)
values
(suser_sname(),'TherapeuticArea',ERROR_NUMBER(),

ERROR_SEVERITY(),ERROR_STATE(),@errormessage)
Return @@ERROR
END

commit transaction
END TRY


BEGIN CATCH
ROLLBACK TRANSACTION
-- Log the error
select @errormessage = 'update TherapeuticAreadescription
Failed',@tablename =
'TherapeuticArea'

insert
dbo
.Application_Error_Log
(UserName,tablename,errorNumber,errorSeverity,errorState,
errorMessage)
values
(suser_sname
(),'TherapeuticArea',ERROR_NUMBER(),ERROR_SEVERITY(),ERROR_STATE(),ERROR_MESSAGE())

RAISERROR (@errormessage,16,1)
RETURN @@ERROR
END CATCH
END
if not exists (select 1 from TherapeuticArea as TA
Inner Join iftTherapeuticArea As IftTA On TA.TherapeuticAreaId=IftTA.TherapeuticAreaId
Where IftTA.IFTID=@iftno
and TA.TherapeuticAreaId=@TherapeuticAreaId)

BEGIN
BEGIN TRY
begin transaction
INSERT INTO TherapeuticArea(TherapeuticAreaid,TherapeuticAreadescription)
VALUES(@TherapeuticAreaid,@TherapeuticAreadescription)

if @@RowCount = 0
BEGIN
insert
dbo.Application_Error_Log(UserName,tablename,errorNumber,
errorSeverity,errorState,errorMessage)
values
(suser_sname(),'TherapeuticArea',ERROR_NUMBER(),
ERROR_SEVERITY(),ERROR_STATE(),@errormessage)
Return @@ERROR
END

commit transaction
END TRY

BEGIN CATCH
ROLLBACK TRANSACTION
-- Log the error
select @errormessage = 'update TherapeuticAreaDescription Failed',@tablename = 'TherapeuticArea'
insert dbo.Application_Error_Log (UserName,tablename,errorNumber,errorSeverity,errorState,errorMessage)
values (suser_sname (),@tablename ,ERROR_NUMBER(),ERROR_SEVERITY(),ERROR_STATE(),ERROR_MESSAGE())
RAISERROR (@errormessage,16,1)
RETURN @@ERROR
END CATCH
END