SOLVED- Got it! The problem was that since I am creating the DoParsingStuff *parseThisUrl object in the viewDidLoad method, it's scope was only within that method. So after the method finished, the object got deallocated. I changed it to an instance variable instead and now it works. It gives a different error but that it an entirely different issue.

Issue was:

I have been struggling with trying to integrate the mwfeedparser library in my app for parsing RSS and ATOM feeds. It throws a gives EXC_BAD_ACCESS error which I can't seem to troubleshoot.

        //My Class looks like - My interface looks like:

#import <Foundation/Foundation.h>
#import "MWFeedParser.h"
#import "NSString+HTML.h"

@protocol ParseCompleted <NSObject>

-(void)parsedArray:(NSMutableArray *)parsedArray;

@end
@interface DoParsingStuff : NSObject<MWFeedParserDelegate>
@property (nonatomic,strong) NSMutableArray *parsedItems;
@property (nonatomic, strong) NSArray *itemsToDisplay;
@property (nonatomic,strong) MWFeedParser *feedParser;
@property (nonatomic,strong) NSURL *feedurl;
@property (nonatomic,strong) id <ParseCompleted> delegate;

-(id)initWithFeedURL:(NSURL *)url;
@end

//And Implementaion:

#import "DoParsingStuff.h"


@implementation DoParsingStuff
@synthesize parsedItems = _parsedItems;
@synthesize itemsToDisplay = _itemsToDisplay;
@synthesize feedParser = _feedParser;
@synthesize feedurl=_feedurl;
@synthesize delegate = _delegate;

-(id)initWithFeedURL:(NSURL *)url{
    if(self = [super init]){
        _feedurl=url;
        _feedParser = [[MWFeedParser alloc] initWithFeedURL:_feedurl];
        _feedParser.delegate=self;
        _feedParser.feedParseType=ParseTypeFull;
        _feedParser.connectionType=ConnectionTypeAsynchronously;
    }
    return self;
}

-(void)doParsing{
    BOOL y = [_feedParser parse];
}

# pragma mark -
# pragma mark MWFeedParserDelegate

- (void)feedParserDidStart:(MWFeedParser *)parser {
    //Just tells what url is being parsed e.g. http://www.wired.com/reviews/feeds/latestProductsRss
    NSLog(@"Started Parsing: %@", parser.url);
}

- (void)feedParser:(MWFeedParser *)parser didParseFeedInfo:(MWFeedInfo *)info {
    //What is the Feed about e.g. "Product Reviews"
    NSLog(@"Parsed Feed Info: “%@”", info.title);
    //self.title = info.title;
}

- (void)feedParser:(MWFeedParser *)parser didParseFeedItem:(MWFeedItem *)item {
    //Prints current element's title e.g. “An Arthropod for Your iDevices”
    NSLog(@"Parsed Feed Item: “%@”", item.title);
    if (item) [_parsedItems addObject:item];
}

- (void)feedParserDidFinish:(MWFeedParser *)parser {//This is where you can do your own stuff with the parsed items
    NSLog(@"Finished Parsing%@", (parser.stopped ? @" (Stopped)" : @""));
    [_delegate parsedArray:_parsedItems];
    //[self updateTableWithParsedItems];
}

- (void)feedParser:(MWFeedParser *)parser didFailWithError:(NSError *)error {
    NSLog(@"Finished Parsing With Error: %@", error);
    if (_parsedItems.count == 0) {
        //self.title = @"Failed"; // Show failed message in title
    } else {
        // Failed but some items parsed, so show and inform of error
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Parsing Incomplete" message:@"There was an error during the parsing of this feed. Not all of the feed items could parsed." delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
        [alert show];
    }
    //[self updateTableWithParsedItems];
}



@end

//I am calling this from my main viewcontroller as such:

#import "DoParsingStuff.h"
@interface ViewController : UIViewController <ParseCompleted>
....

//And I have the following methods in my implementation:

    DoParsingStuff *parseThisUrl = [[DoParsingStuff alloc] initWithFeedURL:[NSURL URLWithString:@"http://www.theverge.com/rss/index.xml"]];
    parseThisUrl.delegate=self;
    [parseThisUrl doParsing];

I have the method defined here as-
-(void)parsedArray:(NSMutableArray *)parsedArray{
    NSLog(@"%@",parsedArray);
}

//I stepped through breakpoints- When I try to go through the breakpoints, I see that everything goes fine till the very last [parseThisUrl doParsing]; in my delegate class. After that it starts showing me memory registers where I get lost.

I think it could be due to arc as I have disabled arc on the mwfeedparser files but am using arc in the above classes. If you need the entire project for this, let me know.

I tried it with NSZombies enabled and got a bit more info out of it: -[DoParsingStuff respondsToSelector:]: message sent to deallocated instance 0x6a52480

I am not using release/autorelease/retain etc. in this class...but it is being used in the mwfeedparser library.