cocoa - can't access instance variable on button click

I have a method called getProjects. In my method I parse data from json. I save name and id of the project in my instance variable projectsArray which is an NSMutableArray.

The problem is that I have a button (IBAction) called writeFile and if I try to log the array on click, my app crashes. The error message is ESC_BAD_ACCESS. But why? I am using ARC. `Method getProjects

- (void)getProjects {
int count = 0;
self.projectsArray      = [NSMutableArray arrayWithCapacity:10];
SBJsonParser *parser    = [[SBJsonParser alloc] init];

NSURLRequest *request   = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@projects.json", urlPath]]];
NSData *response        = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSString *json_string   = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
NSArray *projects       = [parser objectWithString:json_string error:nil];

for (NSDictionary *project in projects) {
    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:2];

    [dict setObject:[project objectForKey:@"name"] forKey:@"name"];
    [dict setObject:[project objectForKey:@"id"] forKey:@"id"];

    [self.projectsArray insertObject:dict atIndex:count];
    [self.selectProject addItemWithTitle:[project objectForKey:@"name"]];
    count++;
}

}

And I call the method in applicationDidFinishLaunching

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    [self getProjects];
    NSLog(@"%@", self.projectsArray);
}

The log in my applicationDidFinishLaunching returns my array.