Problem With Sp And Uniqueidentifier

Hi,

I use this procedure to add a record to the db (SQL 2005)
i constantly get this error:

Conversion failed when converting from a character string to uniqueidentifier.

This is the sp:

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER PROC [dbo].[AddBootloader]

@BootName nvarchar(50),
@Version nvarchar(50),
@CSD nvarchar(50),
@CreatorID uniqueidentifier,
@FilePath nvarchar(150),
@FileSize nvarchar(150)


AS
INSERT INTO dbo.EB_Bootloaders

([Bootname]
,[Version]
,[CSD]
,[FilePath]
,[FileSize]
,[CreatorID])


VALUES

(
@BootName,
@Version,
@CSD,
@CreatorID,
@FilePath,
@FileSize)





And this is the table:

USE [Ebdata]
GO
/****** Object: Table [dbo].[EB_Bootloaders] Script Date: 07/12/2006 10:06:42 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[EB_Bootloaders](
[ID] [bigint] IDENTITY(1,3) NOT NULL,
[BootName] [nvarchar](50) COLLATE Latin1_General_CI_AS NULL,
[Version] [nvarchar](50) COLLATE Latin1_General_CI_AS NULL,
[CSD] [nvarchar](50) COLLATE Latin1_General_CI_AS NULL,
[FilePath] [nvarchar](150) COLLATE Latin1_General_CI_AS NULL,
[FileSize] [nvarchar](50) COLLATE Latin1_General_CI_AS NULL,
[CreateDate] [datetime] NULL CONSTRAINT [DF_EB_Bootloaders_CreateDate] DEFAULT (getdate()),
[CreatorID] [uniqueidentifier] NOT NULL,
[UpdateDate] [datetime] NULL,
[UpdateUser] [uniqueidentifier] NULL,
CONSTRAINT [PK_EB_Bootloaders_1] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
USE [Ebdata]
GO
ALTER TABLE [dbo].[EB_Bootloaders] WITH NOCHECK ADD CONSTRAINT [FK_EB_Bootloaders_aspnet_Users] FOREIGN KEY([CreatorID])
REFERENCES [dbo].[aspnet_Users] ([UserId])
NOT FOR REPLICATION
GO
ALTER TABLE [dbo].[EB_Bootloaders] WITH NOCHECK ADD CONSTRAINT [FK_EB_Bootloaders_aspnet_Users1] FOREIGN KEY([UpdateUser])
REFERENCES [dbo].[aspnet_Users] ([UserId])
NOT FOR REPLICATION

The funny thing is that i copied the sp code from another which runs perfect,
I insert a Guid from an asp.net page.

Hope someone can help me here because im am stucked!

Cheers Wimmo