Problem opening Storyline file without Articulate Localization

I created a new Storyline project last week and saved it. I've tried opening it now and it comes up with a pop up saying I need Articulate Localization open it.
I didn't use Articulate Localization to create it so I'm not sure why it's asking this.

When I click 'save languages as projects' it asks me to select a folder. Then it just opens the folder with nothing new in it. When I click 'cancel' it does nothing. I can't open the project at all.

Has anyone else had this issue?