When attempting to migrate site objects, documents and/or list items, Sharegate signals that the server extension is out of date. Please check the link in the details section below to see where to update the extension (on your source or destination).
If you are migrating to SharePoint 2019 using Insane Mode, please see this solution.
Any error code ending with: -031
SharePoint does not offer services for client applications such as Sharegate to be able to create or set certain values, therefore Sharegate cannot preserve the source information for these site objects or items.
You'll need to update to the latest server extension version to ensure all the following use cases are handled properly:
Why you would need the Server Extension
Download and install the latest server extension version (which can be found here) on your destination (or source) SharePoint server. Sharegate will then use this extension to preserve those properties.
Please read the Installation Information for Server Extension here. To view our complete documentation, please click here.
Once you've installed the server extension please refresh your explorer before migrating.