Can't read from a file even though it is there - Swift - ios

Question

I am downloading a file to a destination, and I can confirm that the file is there, in fact I can check whether that file is read-only or writable, but I am getting an error when I try to show the context of this file : "Error Domain=NSCocoaErrorDomain Code=257 "The file “Documents” couldn’t be opened because you don’t have permission to view it. Anyone had this issue before? It's driving me nuts because I can't even track down the location on my computer because I am using my iPad to run the app. Would be grateful if someone could help me out.
Code snippet where I check for a file :
let documentsURL = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let checkValidation = NSFileManager.defaultManager()
if (checkValidation.fileExistsAtPath(documentsURL))
{
print("FILE AVAILABLE");
}
else
{
print("FILE NOT AVAILABLE");
}
print(documentsDirectoryPath)
if checkValidation.isWritableFileAtPath(documentsURL) {
print("File is writable")
} else {
print("File is read-only")
}
var newarray = [Int]()
do{
let data = try String(contentsOfFile: documentsURL as String,
encoding: NSASCIIStringEncoding)
print(data)
print("i am at the do statement")
newarray = data.characters.split(){$0 == ","}.map{
Int(String.init($0).stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet()))!}
print(newarray)
}
catch let error {
print(error)
}