An Ear for Quality (Armorer) Can't Craft

[Raldo]

Synthesize > Requested Items > An Ear For Quality (Armorer)

Once you've selected that, then you add your items. I realize the guy above already basically told you to do that, but I don't see what else you could possibly be doing wrong. If that doesn't work, you're going to need to provide the steps of what you're doing. If it is really a bug, the GM will ask you for that info anyway.

"Check your journal for required materials" just means that, if you forgot what the ingredients are, you should look it up in the journal.