NSInvalidArgumentException when trying to retrieve images - ios

Question

I am getting an error using a "properly working" code in another place:
[Error]: Caught "NSInvalidArgumentException" with reason "*** -[_NSPlaceholderData
initWithContentsOfFile:options:error:]: nil file argument"
I declared an array of arrays group:[[AnyObject]]
In my CellForRowAtIndexPath method in my UITableView I am starting the following query based on an array which is an element of group => group[indexPath.row].
I can get the necessary data without a problem, but when I try to use my getDataInBackgroundWithBlock() method, it throws the error above.
var memberPhotoImages:[UIImage] = [UIImage]()
let buttonImageQuery = PFUser.query()
buttonImageQuery?.whereKey("objectId", containedIn: group[indexPath.row])
buttonImageQuery?.findObjectsInBackgroundWithBlock({ (results, error) -> Void in
if error != nil {
print(error)
} else {
self.memberPhotosFiles.removeAll()
if let results = results {
for result in results {
let buttonPicture = result["firstImage"] as! PFFile
self.memberPhotosFiles.append(buttonPicture)
buttonPicture.getDataInBackgroundWithBlock {
(imageData: NSData?, error: NSError?) -> Void in
if error != nil {
//...
} else {
if let data = imageData {
print("success!")
}}}}}}})
return cell
}
Any ideas how to solve this? tried a lot of typecasting so far, but it must be something else.
edit: It prints "Success!", but also the error msg.

Answer 1

I had to guess from the error, it looks like you're trying to access a file that doesn't exist on the device -[_NSPlaceholderData initWithContentsOfFile:options:error:]: nil file argument The issue could be that you're accessing something from a place where the simulator can get to it (possibly inside the iOS Simulator's files, which are in Application Support,) but the device cannot. Check your code for any hard-coded paths that might lead to a place on your computer rather than accessing the device's filesystem.
It show that your file argument is nil. Most of such cases are due to different file path between simulator and device. Check your code about loading file and compare the path between simulator and device.