You receive the following error message when attempting to place a compatible unit (CU) within a design:
Unable to cast object of type 'System._ComObject' to type 'Miner.Interop.MMAutoUpdaterClass'.)
The Miner Event Viewer log may report an error message similar to the following.
2013-02-15 13:07:25,931  ERROR [(null)] - "AutoUpdater failed: ArcFM Place Work Location
On Object Class: SupportStructure
On Event: mmEventFeatureCreate" HRESULT: -2147467262
The problem occurs for point features assigned the 'ArcFM Place Work Location' autoupdater (AU) after the user runs the Phase Swap tool.
The issue may be related to the following bug resolved in ArcFM 10.0.3 SP1 and 10.1.
MM50370 - The 'ArcFM Place Work Location' AU fails after running the Phase Swap tool.
Send the CU to the Targets tab after the Phase Swap. The problem appears to occur only if the CU is in the Targets tab during the Phase Swap.