'String' is not convertable to 'StringLiteralConvertable' - Error

[petershaw]

Hi,

I am trying to replace a NSURLSession with Just. I am failing with a basic file upload.

Here is my code

        Just.post(
              urlString
            , files: [
                "filename": HTTPFile.URL(url, nil)
            ]
            , auth: (account.username, account.password)
            ) { (r: HTTPResult) in
                print("***** \(r.statusCode)")
                dump(r.text)
        }

But i cet a compile error 'String' is not convertable to 'StringLiteralConvertable' on the "filename" string in line 4.

does someone has an idea?

[dduan]

Hi @petershaw, experience shows that this kind of error is usually caused by optional values being used where their non-optional counter-parts are expected. Swift is not mature enough to report this accurately.

So, without seeing the rest of your code, I would guess that at least one of url, account.username, account.password is an optional that need unwrapping.