When attempting to migrate site objects, documents, and/or list items, ShareGate signals that the Server Extension is not installed.
Any error code ending with: -027
When installed on a destination on-premises server, the Server Extension helps lift some migration limitations and enables Insane mode.
For more information on what the Server Extension helps to preserve, see List of values the Server Extension preserves.
Review the articles Installation - Server Extension and Server Extension checklist to install the extension on your on-premises server(s).
Notes: The Server Extension is not compatible with SharePoint 2003. As of November 2021, ShareGate is no longer able to provide full support for SharePoint Server 2003 and 2007, which are past the end of their Microsoft support lifetime. For more information, see Contacting our technical support team.