Application Keeps Crashing on Calling composer

ios
objective-c
swift

#1

Hello everyone, I am having some serious issue i cannot figure out. I just installed TwitterKit , followed all directions, i.e. updated info.plist , appDeveloper added [[Twitter sharedInstance]startWithConsumerKey:@“xxx” consumerSecret:@“xxx”]; and in my class calling the below code. Application keeps crashing in main nil object for self

keeps crashing on this line -> [composer showFromViewController:self.navController completion:^(TWTRComposerResult result) {

self.navController = [[UINavigationController alloc]initWithNibName:@"TwitterViewController" bundle:NULL]; 
 composer = [[TWTRComposer alloc] init];
     
    [composer setText:@"just setting up my Twitter Kit"];
    [composer setImage:[UIImage imageNamed:@"twitterkit"]];

    // Called from a UIViewController
    [composer showFromViewController:self.navController completion:^(TWTRComposerResult result) {
        if (result == TWTRComposerResultCancelled) {
            NSLog(@"Tweet composition cancelled");
        }
        else {
            NSLog(@"Sending Tweet!");
        }
    }];

Regards
JZ