Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation error in Workflow Agent

Question / Problem:

Why is the following error logged when a certain Workflow Agent is run?

[ACWFLIB] 12001 Workflow Agent Error "MyWorkflowAgne.Net" (-2146233079) Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOn

Answer / Solution:

This can occur if a Workflow Agent, or a third-party component utilized by the Workfow Agent, attempts to display a modal dialog.

Like Release Scripts / Export Connectors, Workflow Agents should not display any User Interface elements, as they are often called from a module running as a Windows Service.

Applies to: