TERMINATION Stack is not empty at destruction. Error Swift - swift

Question

I am using Google Mobile Vision to detect face landmarks and the distances between them. The weird thing about this error is that it is not consistent and does not show up all the time I run the same function.
Here is the error message...
TERMINATION
ert_Error ebs_ObjectStack::~ebs_ObjectStack():
Stack is not empty at destruction.
This can be an indiaction for a stack leak.
Please check the code where this instance was used.
libc++abi.dylib: terminating with uncaught exception of type ert_Error
(lldb)
Usually the first time I run the app in 24 hours everything goes smoothly and occasionally afterwards. For the most part though it appears. As I said earlier I am using Google Mobile Vision to detect and store certain values.
Here is the function that is causing the error...
func train2(image2: UIImage) {
print("TRAIN2 has been called")
// let options1 = [GMVDetectorFaceLandmarkType: GMVDetectorFaceLandmark.all.rawValue, GMVDetectorFaceClassificationType: GMVDetectorFaceClassification.all.rawValue, GMVDetectorFaceTrackingEnabled: true, GMVDetectorFaceMinSize: 0.09] as [String : Any]
var deviceOrientation = UIDevice.current.orientation
var devicePostion = AVCaptureDevice.Position.back //.Position(rawValue: (currentCameraPosition?.hashValue)!)
if CameraController().currentCameraPosition == .rear {
devicePostion = AVCaptureDevice.Position.back
}else if CameraController().currentCameraPosition == .front {
devicePostion = AVCaptureDevice.Position.front
}
var lastKnownDeviceOrientation = UIDeviceOrientation(rawValue: 0)
var orientation = GMVUtility.imageOrientation(from: deviceOrientation, with: devicePostion, defaultDeviceOrientation: lastKnownDeviceOrientation!)
var options3 = [GMVDetectorImageOrientation:orientation.rawValue]
// var sampbuff = cvPixelBufferRef(from: image2)
// var AImage = GMVUtility.sampleBufferTo32RGBA(sampbuff as! CMSampleBuffer)
var happyFaces = GfaceDetector.features(in: image2, options: options3) as! [GMVFaceFeature] // THE ERROR SEEMS TO ORIGINATE FROM THIS LINE
print("The Amount Of Happy Faces is: \(happyFaces.count)")
for face:GMVFaceFeature in happyFaces {
print(face.smilingProbability)
print("Go Google")
var YAngle = Float(face.headEulerAngleY)
var ZAngle = Float(face.headEulerAngleZ)
print("Y Angle \(YAngle), Z Angle \(ZAngle)")
if YAngle > -2.0 && YAngle < 4.0 && ZAngle > -2.0 && ZAngle < 2.0 {
var proportion = ((face.bounds.width * face.bounds.width) + (face.bounds.height * face.bounds.height))
var ratio = sqrtf(Float(proportion))
DBetweenEyes = (Float(distanceBetween(face.leftEyePosition, face.rightEyePosition)) * 1000) / ratio
DBetweenLEyeAndLEar = (Float(distanceBetween(face.leftEyePosition, face.leftEarPosition)) * 1000) / ratio
DBetweenREyeAndREar = (Float(distanceBetween(face.rightEyePosition, face.rightEarPosition)) * 1000) / ratio
DBetweenLEarAndREar = (Float(distanceBetween(face.leftEarPosition, face.rightEarPosition)) * 1000) / ratio
DBetweenLEyeAndNose = (Float(distanceBetween(face.leftEyePosition, face.noseBasePosition)) * 1000) / ratio
DBetweenREyeAndNose = (Float(distanceBetween(face.rightEyePosition, face.noseBasePosition)) * 1000) / ratio
DBetweenLEyeAndMouth = (Float(distanceBetween(face.leftEyePosition, face.bottomMouthPosition)) * 1000) / ratio
DBetweenREyeAndMouth = (Float(distanceBetween(face.rightEyePosition, face.bottomMouthPosition)) * 1000) / ratio
DBetweenLEarAndMouth = (Float(distanceBetween(face.leftEarPosition, face.bottomMouthPosition)) * 1000) / ratio
DBetweenREarAndMouth = (Float(distanceBetween(face.rightEarPosition, face.bottomMouthPosition)) * 1000) / ratio
print("Distances Established")
}
}
}
I have just discovered that the error is very rare when called when a button is pressed after the view loads. The error occurs far more frequently when called in the viewDidLoad method. Could this indicate some sort of pattern? How would I fix this error?
Any help or suggestions are helpful.
Thanks in advance!