Fatal error: Public Key / Authentication Endpoint is not defined while initalizing the SDK

[soyoungcheng]

Describe the bug
Got Fatal Error:
ImageKitIO/ImageKitUploader.swift:55: Fatal error: Public Key / Authentication Endpoint is not defined while initalizing the SDK

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
Upload image without error

Code
`
import SwiftUI
import ImageKitIO
@main struct ImageKitIO_TestApp: App {
init(){
initImageKitIO()
}

var body: some Scene {
    WindowGroup {
        ContentView()
    }
}

func initImageKitIO(){
    _ = ImageKit.init(
        publicKey: "MYPUBLIC_KEY=",
        urlEndpoint: "https://ik.imagekit.io/NAME",
        transformationPosition: TransformationPosition.PATH
    )
}

}

struct ContentView: View {

@State var status: String? = nil

var body: some View {
    Button {
        upload()
    } label: {
        Text("Upload")
    }
    
    if let t = status {
        Text(t)
            .font(.largeTitle)
            .foregroundColor(.red)
    }
}

func upload() {
    guard let image = UIImage(named: "avatar") else {
        print("can't create image")
        return
    }
    
    ImageKit.shared.uploader().upload(
      file: image,
      fileName: "sample-image.jpg",
      useUniqueFilename: true,
      tags: ["demo"],
      folder: "/",
      isPrivateFile: false,
      customCoordinates: "",
      responseFields: "",
      signatureHeaders: ["x-test-header":"Test"],
      progress: { progress in
          // Handle Progress
      },
      completion: { result in
           switch result {
                case .success(let uploadAPIResponse):
                    // Handle Success Response
                    print(uploadAPIResponse)
                    status = "success"
                case .failure(let error as UploadAPIError):
                    // Handle Upload Error
                    status = error.localizedDescription
                case .failure(let error):
                    // Handle Other Errors
                    status = error.localizedDescription
          }
      }
    )
}

}

`

Desktop (please complete the following information):

• Xcode 13.2

Smartphone (please complete the following information):

• iOS 15.2