Linked portal error

Hello all.

I'm trying to make linked portals in Eternity, but this error seems to keep coming up:

"Refused to draw portal (Line=6422) (T=8)

The linedef I have assigned the transition from lower to upper portals has been assigned the action "376", and the upper has been given linedef action "377". What am I doing wrong?

It's hard to say without seeing the map but from a look at the Eternity source my guess would be that you end up rendering the same portal recursively.

Nevermind, problem has been solved. It seems the linedef with the action "377" was flipped in the wrong direction.