Assign 4 the dist call back isnt working

I seem to get a term signal in the call back
here s my code
self.req = [DGDistanceRequest alloc];

NSString *start = self startLocation.text;

NSString *destA = self.endLocationA.text;

NSString *destB = self.endLocationB.text;

NSString *destC = self.endLocationC.text;

NSArray *dests = @[destA,destB,destC];

// changing labels in a loop can this be done?

for ( int i = 0; i < 3; i++)

{

UILabel *labelText = destLabels[i];

labelText.text = @“changed”;

}

//end of test

self .req = [ self .req initWithLocationDescriptions:dests sourceDescription:start];

// save the ViewController

__weak ViewController *weakSelf = self ;

// how many items in responses? how big?

error here->self.req.callback = ^ void (NSArray *responses)

heres the error…
2019-11-15 15:24:45.554036-0500
assignment4[4425:230841] libMobileGestalt MobileGestalt.c:1647: Could not retrieve region info**