Getting an error when trying to upload image to firebase (Swift) - swift

Question

I have the following code:
func upload() {
let localFile = usersImg!
// Create the file metadata
let metadata = StorageMetadata()
metadata.contentType = "image/jpeg"
let storageRef = Storage.storage().reference()
// Upload file and metadata to the object 'images/mountains.jpg'
let uploadTask = storageRef.putFile(from: localFile, metadata: metadata)
// Listen for state changes, errors, and completion of the upload.
uploadTask.observe(.resume) { snapshot in
// Upload resumed, also fires when the upload starts
}
uploadTask.observe(.pause) { snapshot in
// Upload paused
}
uploadTask.observe(.progress) { snapshot in
// Upload reported progress
let percentComplete = 100.0 * Double(snapshot.progress!.completedUnitCount)
/ Double(snapshot.progress!.totalUnitCount)
}
uploadTask.observe(.success) { snapshot in
// Upload completed successfully
}
uploadTask.observe(.failure) { snapshot in
if let error = snapshot.error as NSError? {
switch (StorageErrorCode(rawValue: error.code)!) {
case .objectNotFound:
// File doesn't exist
break
case .unauthorized:
// User doesn't have permission to access file
break
case .cancelled:
// User canceled the upload
break
/* ... */
case .unknown:
// Unknown error occurred, inspect the server response
break
default:
// A separate error occurred. This is a good place to retry the upload.
break
}
}
}
}
The userImg variable is just the image the user selected, if I were to print it out it would look something like this:
Optional(file:///var/mobile/Media/DCIM/100APPLE/IMG_0030.PNG)
However when I run my code and call the method I get the following error:
Thread 12: "*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]"
What does that mean and what am I doing wrong. (By the way I have tried a lot of different methods to upload urls to firebase but with everyone I am getting weird errors so this code is straight from firebase website.

Answer 1

I cannot guarantee anything because I didn’t use this same code although I had to change the rules for my firebase storage and that helped!