Error: 'NSInvalidArgumentException' ... unrecognized selector sent to instance - ios

Question

Here is my problem, I'm trying to make a clone of Snapchat, a very simple one, using Parse.com with the default project given in the page, everything was going ok, until I have to take pictures and save them to send them to an user. With this code:
import UIKit
import Parse
class UsersTableViewController: UITableViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
var usersArray: [String] = []
var activeRecipient: Int = 0
override func viewDidLoad() {
super.viewDidLoad()
var query = PFUser.query()
query?.whereKey("username", notEqualTo: PFUser.currentUser()!.username!)
var users = query?.findObjects()
if let user = users {
for username in user {
println(username.username!!)
usersArray.append(username.username!!)
}
}
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return usersArray.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("snapCell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel?.text = usersArray[indexPath.row]
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
activeRecipient = indexPath.row
pickImage()
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
//Upload image to parse //error come somewhere from here I think
println("Image Selected")
self.dismissViewControllerAnimated(true, completion: nil)
var imageToSend = PFObject(className:"Image")
imageToSend["image"] = UIImageJPEGRepresentation(image, 0.5)
imageToSend["senderUsername"] = PFUser.currentUser()!.username
imageToSend["recipientUsername"] = usersArray[activeRecipient]
imageToSend.save()
}
func pickImage() {
var image = UIImagePickerController()
image.delegate = self
image.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
image.allowsEditing = false
self.presentViewController(image, animated: true, completion: nil)
}
}
The error:
2015-06-24 15:03:13.414 SnapClomSwift[2043:124661] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteMutableData PF_base64EncodedString]: unrecognized selector sent to instance 0x7a648960'
Is not very helpful to debug, any help??
EDIT1: I would think the parse function is the last calling and breaking everything but I'm not sure.
EDIT2: I have I guess fixed but I'm not sure what was in the first place, still. The new code is this:
var imageToSend = PFObject(className:"Image")
//var imageData = UIImagePNGRepresentation(image)
imageToSend["senderUsername"] = PFUser.currentUser()!.username!
imageToSend["recipientUsername"] = usersArray[activeUser]
imageToSend.saveInBackgroundWithBlock({
(success: Bool, error: NSError?) -> Void in
if (success == false) {
// Error.
println("Error horray! \(error?.description)")
} else {
// There was a problem, check error.description
let imageData = UIImagePNGRepresentation(image)
let imageFile = PFFile(name: "image-png", data: imageData)
imageToSend["image"] = imageFile
imageToSend.saveInBackgroundWithBlock({
(success: Bool, error: NSError?) -> Void in
if success == false {
println("something is fucked up \(error?.description)")
} else {
println("Cool")
}
})
println("Done")
}
})
I guess this is not a solution but a workaround so I'm going to accept Zaph's answer.

Answer 1

To see the actual statement that is causing the error add an exception breakpoint:
From the Mian Menu Debug:Breakpoints:Create Exception Breakpoint.
Right-click the breakpoint and set the exception to Objective-C.
Add an action: "po $arg1".
Run the app to get the breakpoint and you will be at the line that causes the exception and the error message will be in the debugger console.