azurecurve digs into Integration Manager Error – ADO Field Is Nothing essentially this error is normally telling you that the data source is not available. You entered it wrong, moved the source, don’t have access to that source, goofed the setup or have it open.
Integration Manager Error – ADO Field Is Nothing | azurecurve
Development & IntegrationInstall, Upgrade & AdminMicrosoft & the GP Ecosystem
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.