Hello.
Getting this error while elevated pipes and Actual Underground Pipes loading

Failed to load mods: Error while running setup for entity prototype "elevated-pipe" (furnace): Invalid fluid pipe connections. For entity direction North connection [fluid box manager box 1 connection 6] collides with [fluid box manager box 1 connection 2]. Definition [type=normal, position={0, 0}, direction=North]

Same from me. I think it was caused by a recent update by Actual Underground Pipes that says "Moved elevated pipes compatibility to elevated pipes" As soon as I updated, my game kept crashing until I removed either one mod or the other.

are BOTH mods updated to the latest version?

Yes, disabling other mods that appear in the list does not change anything.

Thanks for checking, new elevated pipes update is out.

The update fixed the problem