If you have issues like the question ask above regarding the exception thrown when the solution is executed, the problem is permission, not properly granted to the users of that group to access the database/stored procedure. All you need do is to do something like what i have below, replacing mine with your database name, stored procedures (function)and the type of permission or role or who you are granting the access to.

USE [StableEmployee]
GO
GRANT EXEC ON dbo.GetAllEmployees TO PUBLIC

/****** Object: StoredProcedure [dbo].[GetAllEmployees] Script Date: 01/27/2016 16:27:27 ******/

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[GetAllEmployees]
as
Begin
Select EmployeeId, Name, Gender, City, DepartmentId
From tblEmployee

End