My AI Is Being Stubborn

My melee AI that I'm working on refuses to create Spirit Walkers. Everything else works properly, but when I add Spirit Walkers in there it refuses to create them. And even worse, it doesn't just skip them, it gets stuck on the Spirit Walker and then will build nothing further (other than rebuilding units/buildings that die).

Is the melee AI just incapable of producing Spirit Walkers for some reason? Or is there a way to get around this? I would post my AI but I'm mostly looking for confirmation that this happens to other people - my AI isn't wrong, because any other unit I build instead of the Spirit Walker works fine.

no, you have to order to your AI to train the Spirit Walker in ethereal form.

Oh! Should have thought of that, I noticed that they were created in ethereal form but didn't make the connection. Thanks.