index 0 beyond bounds for empty array parse.com - ios

Question

I'm trying to parse a list of objects that the current user has created to a custom table view from Parse.com. I'm getting this error when I run it:
[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array
Here's how I'm doing it:
#interface ProfileViewController ()
#property (nonatomic, retain) PFQuery *query;
#end
#implementation DailyProfileViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self refresh];
self.tableView.delegate = self;
_projects = [[NSMutableArray alloc] initWithCapacity:100];
}
- (void)refresh {
PFQuery *query = [PFQuery queryWithClassName:#"Projects"];
[query includeKey:#"user"];
[query whereKey:#"user" equalTo:[PFUser currentUser]];
[query orderByDescending:#"createdAt"];
[query findObjectsInBackgroundWithBlock:^(NSArray *posts, NSError *error) {
if (!error) {
[_projects setArray:posts];
[self.tableView reloadData];
NSLog(#"%#", posts);
return;
}
NSLog(#"Fetch posts error: %#", error.localizedDescription);
return;
}];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return _projects.count;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 65;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
_project = [_projects objectAtIndex:indexPath.row];
ProfileProjectTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"ProfileProjectTableViewCell"];
if (!_user) _user = [PFUser currentUser];
cell.item = _project;
[(PFFile*)_project[#"profilePic"] getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
cell.profilePic.image = [UIImage imageWithData:data];
}];
[(PFFile*)_project[#"bgImage"] getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
cell.bgView.image = [UIImage imageWithData:data];
}];
cell.projectName.text = _project[#"name"];
return cell;
}
#end

Answer 1

Please change your viewDidLoad like this..
self.tableView.delegate = self;
_projects = [[NSMutableArray alloc]init];
[self refresh];
you should call refresh method after intializing array and make sure that the data you are adding should not empty

Answer 2

Why are you calling - refresh before initialising your array? Change your -viewDidLoad as such:
- (void)viewDidLoad {
[super viewDidLoad];
self.tableView.delegate = self;
_projects = [[NSMutableArray alloc] init];
[self refresh];
}