MakeOTF error: "empty block" in feature dig in line:2

When I try to export my font I get this error message…

What is the issue and how do I fix it?

As it says, the issue is that there is an empty block in your feature dlig. So I would take a look at the OT features. What does you feature dlig look like? And the one before that?

I don’t know what “feature dlig” is. Can you explain? Where would I find that?

File > Font Info > Features > dlig. It is the opentype feature for discretionary ligatures. Auto-triggered by ligature glyphs with underscores in their glyph name.

Got it. Thanks!