Why MobFox ad loading failing with error - Error parsing xml response from server

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I have implemented MobFox banner ad in my iPhone project, but it fails with error - (null). I have followed the MobFox SDK integration guide(comes with MobFox SDK).\[code\]mobFoxBanner = [[MobFoxBannerView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];mobFoxBanner.delegate = self;mobFoxBanner.backgroundColor = [UIColor clearColor];[self.view addSubview:mobFoxBanner];\[/code\]I have implemented the all delegate methods and also set the Other Linker flag value to -ObjC. but it is not working.It is calling following delegate\[code\]- (void)mobfoxBannerViewMobFoxBannerView *)banner didFailToReceiveAdWithErrorNSError *)error { [delegate performSelectorselector(adReived withObject:[NSNumber numberWithInt:0]]; NSLog(@"MobFox : Failed to receive ad with error: %@", [error localizedDescription]);}\[/code\]Out Put - MobFox : Failed to receive ad with error: Error parsing xml response from server