unity 加载Assetbundle资源时 出现了重复加载?

The AssetBundle 'Memory' can't be loaded because another AssetBundle with the same files is already loaded.

unity 加载Assetbundle资源时 出现了重复加载 然后就会出现这种报错

    ....
      m_RequestOperation = AssetBundle.LoadFromMemoryAsync(outbys);//异步加载缓存
       if (m_RequestOperation.isDone)
        {
            LocalRequestOperationCompleted(m_RequestOperation); //已经加载完成
        }
        else
            m_RequestOperation.completed += LocalRequestOperationCompleted;
    ....

    private void LocalRequestOperationCompleted(AsyncOperation op)
    {
        if (op as AssetBundleCreateRequest != null)
        {
            m_AssetBundle = (op as AssetBundleCreateRequest).assetBundle;
            ProvideHandleComplete(this, m_AssetBundle != null, null);
            m_Completed = true;
        }
    }