Mssql 2005. How To Make Update Stored Procedure ?

Hi ~

I made simple stored procedure that is to update user information following as...

ALTER PROCEDURE UpdateUserProfile
(
  @user_id uniqueidentifier,
  @user_firstname nvarchar(50),
  @user_lastname nvarchar(50),
  @user_birth nvarchar(20),
  @user_gender nvarchar(20)
  )

AS 

 UPDATE user_profile
    SET    
    user_firstname = @user_firstname,
    user_lastname = @user_lastname,
    user_birth = @user_birth,
    user_gender =  @user_gender
  WHERE user_id = @user_id
 
RETURN

When I tried to save this procedure, I faced on "Invalid Object : UpdateUserProfile" error message.

What's the problem ?