StructureMap WithTorArg-缺少引用?

'StructureMap.Configuration.DSL.Expressions.CreatePluginFamilyExpression'不包含'WithTorArg'的定义,并且没有扩展方法'WithTorArg'接受类型的第一个参数'StructureMap.Configuration.DSL.Expressions.CreatePluginFamilyExpression找不到“”(是否缺少using指令或程序集引用?)

我试图编译的代码如下:

using DomainModel.Abstract;
using DomainModel.Concrete;
using StructureMap;
using StructureMap.Pipeline; //The only WithCtorArg methods I can find are in this namespace, it didn't help.

namespace WebUI
{
public class ContainerBootstrapper
{
    public static void BootstrapStructureMap()
    {
        // Initialize the static ObjectFactory container
        ObjectFactory.Initialize(x =>
        {
            x.ForRequestedType<IProductsRepository>()
                .TheDefaultIsConcreteType<SqlProductsRepository>()
                .WithCtorArg("connectionString")
                .EqualToAppSetting("SqlConnection");
        });
    }
}
}