"Can't elaborate user hierarchy auto_fab_0" on adding signal_tap

The screenshot is illegible.

But what signals are you trying to tap that make it work when they are not tapped? From the message, perhaps you are trying to tap an internal memory block signal that can't be tapped. When you add signals to Signal Tap, make sure you use the Node Finder and set the filter to "Signal Tap: pre-synthesis" (preferred since you can tap your direct RTL signals) or "Signal Tap: post-fit".