WiX检查.NET Framework 4

我添加了以下内容：

<Wix xmlns="http://scheR_504_11845@as.microsoft.com/wix/2006/wi" xmlns:netfx="http://scheR_504_11845@as.microsoft.com/wix/NetFxExtension">

        <PropertyRef Id="NETFRAMEWORK40FULL"/>
        <Condition message="This application requires .NET Framework 4.0. Please install the .NET Framework then run this installer again. Contact support at support@Swiftposter.com if you have further issues.">
            <![CDATA[Installed OR NETFRAMEWORK40FUL]]>
        </Condition>

然而,它总是似乎导致错误,因为它仍然阻止我,即使你有完整的.NET框架安装(不只是客户端).

这是怎么回事？