"No targets to convert found" when trying to convert to current Swift syntax

Question

I have searched quite a bit and can't seem to find an answer for this specific problem. I have a project that is a bit older and written in Swift 2. I am trying to convert it to Swift 4, by going to "Edit > Convert > To current Swift Syntax..."

It opens a modal, which is blank inside, at the top says: "No targets to convert found."

I have tried messing around with it, just can't seem to figure this out. Any help is appreciated! Screenshot of what I get here

Answer 1

Use Xcode 10.1 to convert swift 3.0 to swift 4.2, then use Xcode 11.2 to convert swift 4.2 to swift 5.0.