在SQL Server CLR汇编中使用Microsoft Solver Foundation

我目前正在编写自己的CLR存储过程，我需要使用Microsoft solver Foundation的求解器。

为了能够在我的CLR项目中添加对microsoft Solver Foundation的引用，我需要将该程序集添加到我的SQL Server实例(源)。所以我安装了MS Solver Foundation Redistributable，并使用以下脚本在SQL Server中注册为服务器管理员:

USE MYDB
ALTER DATABASE MYDB SET TRUSTWORTHY ON WITH ROLLBACK IMMEDIATE
ALTER DATABASE MYDB SET TRUSTWORTHY ON
CREATE ASSEMBLY MicrosoftSolverFoundation
AUTHORIZATION dbo
FROM 'C:'Program Files (x86)'Reference Assemblies'Microsoft'Framework'.NETFramework'v4.0'Microsoft.Solver.Foundation.dll' 
WITH PERMISSION_SET = UNSAFE

但是，我得到以下错误:

Assembly 'MicrosoftSolverFoundation' could not be installed because existing policy would keep it from being used.

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附加信息

CLR版本:

directory   C:'Windows'Microsoft.NET'Framework64'v4.0.30319'
version v4.0.30319
state   CLR is initialized

SQL Server Version:

Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64) 
Dec 28 2012 20:23:12 
Copyright (c) Microsoft Corporation
Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1) (Hypervisor)