Errors when using two Asynchronous ASIHTTP Requests in different classes - ios

Question

Suppose i have two classes A & B. class A calls the asynchronus method Foo in class B. Foo method fetches data using asynchronous ASIHTTPRequest and send the data from Foo back as the return value to Class A. Class A will use that returned data and do the things
I am creating a object of my class URLParser here in another class and calling the function getJsonUrl , it will parse and get the json url for me . I am using that returned URL in another ASIHTTPRequest here . But i am getting EXC_BAD_ACCESS ...help me to figure it out ....
......
URLParser *urlParser = [[URLParser alloc] init];
NSString *JsonString = [urlParser getJsonUrl:#"http://mywebs.com/?q=iphone/news"];
NSLog(#" url returned = %#" ,JsonString);
NSURL *JsonUrl = [NSURL URLWithString:JsonString];
newsRequest = [ASIHTTPRequest requestWithURL:JsonUrl];
[newsRequest setDelegate:self];
[newsRequest startAsynchronous];
}
- (void)requestFinished:(ASIHTTPRequest *)request
{
newsDictionary = [[NSMutableDictionary alloc] init];
NSData *responseData = [request responseData];
NSString *response = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding] ;
self.newsDictionary = [response JSONValue];
[response release];
[self getDataNews:self.newsDictionary];
}
URL Parser Class
#synthesize albumDic;
#synthesize GlobalRequest;
-(NSString*)getJsonUrl:(NSString *)url{
GlobalRequest = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:url]];
[GlobalRequest setDelegate:self];
[GlobalRequest startAsynchronous]; // when i called the [GlobalRequest startSynchronous] ....both cases m getting the same error
return JsonStr;
}
- (void)requestFinished:(ASIHTTPRequest *)request{
albumDic = [[NSMutableDictionary alloc] init];
NSData *responseData = [request responseData];
NSString *response = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding] ;
self.albumDic = [response JSONValue];
[response release];
[self GetDictionary:self.albumDic];
}
- (void)requestFailed:(ASIHTTPRequest *)request{
[request cancel];
}