Server-side activities have been updated. You need to restart SharePoint Designer to use the updated version of activities.

SharePoint 在配置完成工作流以后，使用Designer配置工作流的时候，可能会遇到如下错误。

Server-side activities have been updated.

You need to restart SharePoint Designer to use the updated version of activities.

解决方法：

https://support.microsoft.com/en-us/help/3114337/january-12-2016-update-for-sharepoint-designer-2013-kb3114337