AVAudioSessionでの録音がうまくいきません。

Xcodeで下記のように記述してビルドし、ボタンを押して録音を開始すると

[ViewController.h]

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>

@interface ViewController : UIViewController<UIGestureRecognizerDelegate,AVAudioRecorderDelegate,AVAudioPlayerDelegate> {

    //音声録音
    AVAudioRecorder *recorder1;
    AVAudioSession *session;
    AVAudioPlayer *player;

}

- (IBAction)rec_btn:(id)sender;
- (IBAction)play_btn:(id)sender;
@end

[ViewController.m]

- (IBAction)rec_btn:(id)sender {
// recorder1録音
                               NSError *error = nil;
                               session = [AVAudioSession sharedInstance];

                               if ( session.inputAvailable )   // for iOS6 [session inputIsAvailable]  iOS5
                               {
                                   [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];
                               }

                               if ( error != nil )
                               {
                                   NSLog(@"Error when preparing audio session :%@", [error localizedDescription]);
                                   return;
                               }
                               [session setActive:YES error:&error];
                               if ( error != nil )
                               {
                                   NSLog(@"Error when enabling audio session :%@", [error localizedDescription]);
                                   return;
                               }

                               // File Path
                               NSString *dir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
                               NSString *filePath = [dir stringByAppendingPathComponent:@"voice_rec1.caf"];
                               NSURL *url = [NSURL fileURLWithPath:filePath];

                               // recorder = [[AVAudioRecorder alloc] initWithURL:url settings:nil error:&error];
                               recorder1 = [[AVAudioRecorder alloc] initWithURL:url settings:[self setAudioRecorder] error:&error];

                               //recorder.meteringEnabled = YES;
                               if ( error != nil )
                               {
                                   NSLog(@"Error when preparing audio recorder :%@", [error localizedDescription]);
                                   return;
                               }

                               recorder1.delegate=self;
                               //    7秒録音して終了する場合
                               [recorder1 recordForDuration: 7.0];
                               [recorder1 record];

                               //再生準備
                               [player prepareToPlay];
}

//play_btn
- (IBAction)play_btn:(id)sender {

    [player play];

}

ログに以下のような表示が出て録音がうまくいきません。

[Common] _BSMachError: port 6f03; (os/kern) invalid name (0xf) "Unable to deallocate send right"

解決方法をアドバイス頂けると幸いです。
googleで検索してもあまり出てこないので…。

「使用環境」
Xcode Version 8.2.1 (8C1002)
MacOSX Sierra 10.12.3