Issue Deleting Row from UITableView - ios

Question

I'm using Parse to populate a table view which works fine. I'm trying to delete a row from the table view but get this error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI length]: unrecognized selector sent to instance 0x7fd3f0f20f60'
Here is the code:
#import "CompletedJobs.h"
#import <Parse/Parse.h>
#interface CompletedJobs ()
#property (nonatomic, strong) NSMutableArray *jobs;
#property (nonatomic, strong) NSMutableArray *objectIds;
#property (nonatomic, strong) UIActivityIndicatorView *loadingIndicator;
#property (nonatomic, strong) UIRefreshControl *refresh;
#end
#implementation CompletedJobs
- (void)viewDidLoad {
[super viewDidLoad];
[self.tableView setDataSource:self];
[self.tableView setDelegate:self];
self.navigationItem.rightBarButtonItem = self.editButtonItem;
CGFloat width = CGRectGetWidth(self.view.bounds);
CGFloat height = CGRectGetHeight(self.view.bounds);
self.loadingIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(width / 2, height / 2, 37, 37)];
self.loadingIndicator.center = CGPointMake(width / 2, height / 2 - 37);
self.loadingIndicator.autoresizingMask = (UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin);
self.loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
self.loadingIndicator.hidesWhenStopped = YES;
[self.view addSubview:self.loadingIndicator];
[self.loadingIndicator startAnimating];
[self getJobs];
self.refresh = [[UIRefreshControl alloc]init];
self.refresh.tintColor = [UIColor blackColor];
[self.refresh addTarget:self action:#selector(refreshData) forControlEvents:UIControlEventValueChanged];
self.refreshControl = self.refresh;
}
- (void)viewDidAppear:(BOOL)animated {
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)getJobs {
self.jobs = [[NSMutableArray alloc]init];
self.objectIds = [[NSMutableArray alloc]init];
PFQuery *query = [PFQuery queryWithClassName:#"Completed"];
[query setLimit:1000];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
for (NSDictionary *objectDictionary in objects) {
[self.jobs addObject:objectDictionary];
for (int i = 0; i < self.jobs.count; i++) {
[self.objectIds addObject:[self.jobs valueForKeyPath:#"objectId"]];
}
}
dispatch_async(dispatch_get_main_queue(), ^ {
[self.tableView reloadData];
[self.loadingIndicator stopAnimating];
});
}
else {
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
- (void)refreshData {
[self getJobs];
[self.refresh endRefreshing];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return self.jobs.count;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
NSString *objectId = [self.objectIds objectAtIndex:indexPath.row];
PFQuery *query = [PFQuery queryWithClassName:#"Completed"];
[query getObjectInBackgroundWithId:objectId block:^(PFObject *job, NSError *error) {
[job deleteInBackground];
}];
[self getJobs];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"UITableViewCell"];
NSDictionary *jobDictionary = [self.jobs objectAtIndex:[indexPath row]];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"UITableViewCell"];
}
if (cell) {
cell.backgroundColor = [UIColor clearColor];
cell.textLabel.textColor = [UIColor blackColor];
cell.textLabel.text = [jobDictionary objectForKey:#"job"];
NSString *completedBy = [jobDictionary objectForKey:#"completedBy"];
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
formatter.dateStyle = NSDateFormatterLongStyle;
formatter.timeStyle = NSDateFormatterShortStyle;
NSString *completedDate = [formatter stringFromDate:[jobDictionary objectForKey:#"date"]];
NSString *detailString = [NSString stringWithFormat:#"Completed by: %# on %#", completedBy, completedDate];
cell.detailTextLabel.text = detailString;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
}
#end