Module compiled with Swift 2.3 cannot be imported in Swift 3.0.1

[mchenja]

I'm working with a couple partners on a project.
For my partners, the Charts library works fine, but when they zip their code and send it to me, and I try to compile it, I get an error:

Is there a simple fix for this problem that doesn't require me rewriting a bunch of code?
I tried the suggestions mentioned in issue #1788, but they don't seem to be working.

[mchenja]

nvm, figured out what i was doing wrong. The reason changing "Use Legacy Swift Language Version" settings didn't work initially is because I was changing the release settings and not the debug settings.