Swagger Inspector - Create API Definition

I am using Swagger inspector - I have my call working, seeing the response I expect.  Now I want to use CREATE API DEFINITION, but when I hit that button all I can get is a popup window entitled "Something Went Wrong" -  no suggestions for what I might need to change, no details about the error.  Can anyone tell me what's going on?  Should this thing be working?  Thanks for any help you can provide!