Ios 线程1：致命错误：隐式展开可选值时意外发现nil，如何修复该错误？请帮帮我

线程1:致命错误：隐式展开可选值时意外发现nil

这就是我得到的错误，我在：mapView.addAnnotation（annotations）处得到错误。我真的不知道该怎么办。我在swift中使用平板电脑菜单，这是firstviewcontroller。请有人帮帮我。 以下是我编写的代码：

import UIKit
import MapKit

class FirstViewController: UIViewController{
    
    @IBOutlet weak var mapView: MKMapView!
    fileprivate let locationManager:CLLocationManager = CLLocationManager()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // call annotations functions and put in annotationLocations
        createAnnotations(locations: annotationLocations)
        
        locationManager.requestWhenInUseAuthorization()
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.distanceFilter = kCLDistanceFilterNone
        locationManager.startUpdatingLocation()
        
        mapView.showsUserLocation = true
        
    }
    
    // annotations location(s)
    let annotationLocations = [
        ["title": "Esso Kampen, Europa-Allee 4, 8265 VB, Kampen ", "latitude": 52.5429, "longitude": 5.9193],
        ["title": "Esso Kampen, Installatieweg 7-a, 8263 BS, Kampen", "latitude": 52.56830596923828, "longitude":5.879432678222656],
        ["title": "Esso IJsselmuiden, Spoorstraat 10, 8271 RH, IJsselmuiden", "latitude": 52.55617141723633, "longitude":5.931605815887451],
        ["title": "Esso IJsselmuiden, Ondernemersstraat 12, 8271 RS, IJsselmuiden", "latitude":52.554344177246094, "longitude": 5.939723014831543],
        ["title": "Esso Westwal, Westwal 1, 8321 WG, Urk", "latitude":52.6515101, "longitude":5.6190208],
        ["title": "Esso Elburg, Havenkade 2, 8081 GP, Elburg", "latitude":52.450706, "longitude":5.8280084],
        ["title": "Esso Aalst, Maas-waalweg 1, 5308 NS, Aalst", "latitude":51.779178619384766, "longitude":5.141426086425781],
        ["title": "Firezone Aalten, De Driehoek 1, 7122 TL, Aalten", "latitude":51.9280956, "longitude":6.5643974],
        ["title": "Firezone Oldeboarn, Sudkant 15, 8495 KM, Aldeboarn", "latitude":53.046293, "longitude":5.888884],
        ["title": "Esso Alkmaar MLK, Martin Luther Kingweg 51, 1817 MK, Alkmaar", "latitude":52.6446464, "longitude":4.7293343],
        ["title": "Firezone Alkmaar Huiswaarderweg, Huiswaarderweg 2, 1817 JS, Alkmaar", "latitude":52.6458756, "longitude":4.7382983],
        ["title": "Fuwell Alkmaar, Smaragdweg 1, 1812 RJ, Alkmaar", "latitude":52.609012, "longitude":4.756206],
        ["title": "Texaco Alkmaar, Robbenkoog 10, 1822 BB, Alkmaar", "latitude":52.6420575, "longitude":4.7821996],
        ["title": "Esso Almelo HR Holstlaan, H.R. Holstlaan 91, 7609 RC , Almelo", "latitude":52.3281816, "longitude":6.6495139],
        ["title": "Firezone Almelo, Burg. Raveslootsingel 6, 7607 GK, Almelo", "latitude":52.34979, "longitude":6.66009],
        ["title": "Esso Almere, Koningsbeltweg 1, 1329 AA, Almere", "latitude":52.3751158, "longitude":5.2747946],
        ["title": "Esso Almere Markerkant, Markerkant 10/01 , 1316 AA, Almere", "latitude":52.385953, "longitude":5.217036],
        ["title": "Esso Almere Hogering, Audioweg 2, 1322 AV , Almere", "latitude":52.34921, "longitude":5.17451],
        ["title": "Esso Alphen a/d Rijn, Willem de Zwijgerlaan 37, 2406 HD, Alphen a/d Rijn", "latitude":52.19819, "longitude":4.41177],
        ["title": "Esso Amersfoort Hogeweg, Hogeweg 45, 3816 BM, Amersfoort", "latitude":50.87979, "longitude":5.93174],
        ["title": "Esso Amersfoort Neerduist, Rijksweg A1 noordzijde, 3821 CH, Amersfoort", "latitude":52.205585, "longitude":5.3844],
        ["title": "Esso Amstelveen, Ouderkerkerlaan 150, 1185 AG, Amstelveen", "latitude":52.297044, "longitude":4.865962],
        ["title": "Esso Amstelveen Beneluxbaan Oost, Beneluxbaan 10 Oost, 1183 ZZ, Amstelveen", "latitude":52.317709, "longitude":4.870159],
        ["title": "Esso Express Amstelveen Beneluxbaan West, Beneluxbaan 9 West, 1181 ZZ, Amstelveen", "latitude":52.317307, "longitude":4.869668],
        ["title": "Esso Vissers Amstenrade, Hommerterweg 292-2, 6436 AM, Amstenrade", "latitude":50.934569, "longitude":5.916655],
        ["title": "Esso Amsterdam J v Hasseltweg, Johan van Hasseltweg 73, 1021 KN , Amsterdam", "latitude":52.387029, "longitude":4.924821],
        ["title": "Esso Amsterdam Marnixstraat, Marnixstraat 250 , 1016 TL, Amsterdam", "latitude":52.369842, "longitude":4.877018],
        ["title": "Esso Amsterdam Meer en Vaart, Meer en Vaart 201, 1068 LA, Amsterdam", "latitude":52.35523, "longitude":4.81045],
        ["title": "Esso Amsterdam Sarphatistraat, Sarphatistraat 225, 1018 AE, Amsterdam", "latitude":52.36685, "longitude":4.92415],
        ["title": "Esso Amsterdam Pieter Caland, Pieter Calandlaan 89, 1065 KK, Amsterdam", "latitude":52.3559, "longitude":4.82452],
        ["title": "Esso Amsterdam Utrechtse Brug, Nieuwe Utrechtseweg 10, 1096 CK, Amsterdam", "latitude":52.33214, "longitude":4.91194],
        ["title": "Texaco Amsterdam Kollenbergweg, Kollenbergweg 11, 1101 AR, Amsterdam Zuidoost", "latitude":52.305681, "longitude":4.934042],
        ["title": "Esso Apeldoorn, Rijksweg A50 westzijde, 7372 BJ, Apeldoorn", "latitude":52.169628, "longitude":6.024606],
        ["title": "Firezone Apeldoorn Edisonlaan, Edisonlaan 270, 7316 JL, Apeldoorn", "latitude":52.2305509, "longitude":5.9604756],
        ["title": "Firezone Apeldoorn Laan van Zeven, Laan van Zevenhuizen 396, 7322 NW, Apeldoorn", "latitude":52.2207337, "longitude":5.9985234],
        ["title": "Esso Appingedam, Farmsumerweg 60, 9902 BT, Appingedam", "latitude":53.319883, "longitude":6.870897],
        ["title": "Esso Arnhem IJsseloordweg, IJsseloordweg 42, 6825 LE, Arnhem", "latitude":51.978645, "longitude":5.971316],
        ["title": "Esso Arnhem Overmaat, Burg. Matsersingel 30, 6831 ZA, Arnhem", "latitude":51.95184, "longitude":5.88583],
        ["title": "Esso Arnhem de Slenk, Rijksweg A50 oostzijde, 6816 VX, Arnhem", "latitude":52.1664735, "longitude":6.025448],
        ["title": "Esso Express Arnhem, Dr C Lelyweg 13, 6827 BH, Arnhem", "latitude":51.97244, "longitude":5.9348],
        ["title": "Texaco Asten, Rijksweg A67 zuidzijde, 5721 SG, Asten", "latitude":51.404306, "longitude":5.812127],
        ["title": "Esso Baarn Oost, Amsterdamsestraatweg 42a Oostzijde, 3741 GS, Baarn", "latitude":52.221659, "longitude":5.257677],
        ["title": "Esso Express Baarn West, Amsterdamsestraatweg 61 Westzijde, 3741 GS, Baarn", "latitude":52.221114, "longitude":5.257666],
        ["title": "Texaco Bakel, Benthem 3, 5761 PN, Bakel", "latitude":51.49906, "longitude":5.72809],
        ["title": "Firezone Beegden, Heerstraat Noord 60, 6099 AZ, Beegden", "latitude":50.97359, "longitude":5.76655],
        ["title": "Esso Vissers Beek en Donk, Heuvelplein 29, 5741 JH, Beek en Donk", "latitude":51.52807, "longitude":5.63457],
        ["title": "Firezone Beek, Arnhemseweg 13, 7037 CX, Beek Gem Bergh", "latitude":51.908966, "longitude":6.187974],
        ["title": "Texaco Beekbergen, Dorpsstraat 43, 7361 AR, Beekbergen", "latitude":52.1592, "longitude":5.96691],
        ["title": "Texaco Beers, Molenstraat 31-33, 5437 AA, Beers", "latitude":51.726731, "longitude":5.836205],
        ["title": "Esso Beesd, Rijksweg A2 westzijde, 4153 ZA, Beesd", "latitude":52.143648, "longitude":5.000866],
        ["title": "Firezone Belfeld, Craenenakker 4, 5951 CC, Belfeld", "latitude":51.31877, "longitude":6.12664],
        ["title": "Texaco Bellingwolde, Hoofdweg 33, 9695 AA, Bellingwolde", "latitude":53.1014, "longitude":7.14563],
        ["title": "Esso Beneden Leeuwen 1, Van Heemstraweg 35, 6658 KE, Beneden Leeuwen", "latitude":51.88036, "longitude":5.53006]
    ]
    
    // create annotation
    // [Dictionary<String, Any>] or [[String: Any]] works for argument type
    func createAnnotations(locations: [Dictionary<String, Any>]) {
        for location in locations {
            let annotations = MKPointAnnotation()
            annotations.title = location["title"] as? String
            annotations.coordinate = CLLocationCoordinate2D(latitude: location["latitude"] as! CLLocationDegrees,
                                                            longitude: location["longitude"] as! CLLocationDegrees)
            
                mapView.addAnnotation(annotations)
        }
    }
}

导入UIKit
导入地图套件
类FirstViewController:UIViewController{
@ibvar映射视图：MKMapView！
fileprivate let locationManager:CLLocationManager=CLLocationManager（）
重写func viewDidLoad（）{
super.viewDidLoad（）
//调用annotations函数并放入annotationLocations
createAnnotations（位置：annotationLocations）
locationManager.RequestWhenUseAuthorization（）
locationManager.desiredAccuracy=KCallocationAccuracyBest
locationManager.distanceFilter=KCLDistanceFilterOne
locationManager.startUpdatingLocation（）
mapView.showsUserLocation=true
}
//注释位置（个）
让annotationLocations=[
[“标题”：“埃索·坎彭，欧罗巴·阿莱4，8265 VB，坎彭”，“纬度”：52.5429，“经度”：5.9193]，
[“标题”：“埃索·坎蓬，安装图7-a，8263英国标准，坎蓬”，“纬度”：52.56830596923828，“经度”：5.87943267822656]，
[“标题”：“埃索·艾瑟尔穆伊登，斯普罗斯特拉特10，8271右，艾瑟尔穆伊登”，“纬度”：52.55617141723633，“经度”：5.931605815887451]，
[“标题”：“埃索·艾瑟尔穆伊登，昂德尔内默斯特拉特12，8271 RS，艾瑟尔穆伊登”，“纬度”：52.554344177246094，“经度”：5.939723014831543]，
[“标题”：“埃索·韦斯特瓦尔，韦斯特瓦尔18321 WG，乌尔克”，“纬度”：52.6515101，“经度”：5.6190208]，
[“标题”：“埃索·埃尔堡，哈文卡德28081 GP，埃尔堡”，“纬度”：52.450706，“经度”：5.8280084]，
[“标题”：“埃索阿尔斯特，马斯瓦阿尔韦格1538南纬，阿尔斯特”，“纬度”：51.779178619384766，“经度”：5.141426086425781]，
[“标题”：“德德里霍克火区阿尔滕7122 TL，阿尔滕”，“纬度”：51.9280956，“经度”：6.5643974]，
[“标题”：“火区奥德博恩，苏德坎特15，8495公里，奥德博恩”，“纬度”：53.046293，“经度”：5.8888 4]，
[“标题”：“埃索·阿尔克马尔MLK，马丁·路德·金威格511817 MK，阿尔克马尔”，“纬度”：52.64464，“经度”：4.7293343]，
[“标题”：“阿尔克马尔火区-惠斯瓦尔德韦格，惠斯瓦尔德韦格21817 JS，阿尔克马尔”，“纬度”：52.6458756，“经度”：4.7382983]，
[“标题”：“福威尔·阿尔克马尔，斯马拉格德韦格1812 RJ，阿尔克马尔”，“纬度”：52.609012，“经度”：4.756206]，
[“标题”：“德士古阿尔克马尔，罗本孔10，1822 BB，阿尔克马尔”，“纬度”：52.6420575，“经度”：4.7821996]，
[“标题”：“埃索·阿尔梅洛人力资源霍尔斯特兰，H.R.霍尔斯特兰917609 RC，阿尔梅洛”，“纬度”：52.3281816，“经度”：6.6495139]，
[“标题”：“阿尔梅洛火区，伯格，拉维斯洛特辛格67607吉克，阿尔梅洛”，“纬度”：52.34979，“经度”：6.66009]，
[“标题”：“埃索·阿尔梅雷，科宁贝尔特威格1139 AA，阿尔梅雷”，“纬度”：52.3751158，“经度”：5.2747946]，
[“标题”：“埃索·阿尔梅雷·马尔克坎特，马尔克坎特10/011316AA，阿尔梅雷”，“纬度”：52.385953，“经度”：5.217036]，
[“标题”：“埃索·阿尔梅雷·霍格林，奥迪韦格2号，阿尔梅雷大道1322号”，“纬度”：52.34921，“经度”：5.17451]，
[“标题”：“埃索·阿尔芬a/d瑞恩，威廉·德兹维杰格兰37，2406高清，阿尔芬a/d瑞恩”，“纬度”：52.19819，“经度”：4.41177]，
[“标题”：“埃索·阿默斯福尔特·霍格威格，霍格威格453816BM，阿默斯福尔特”，“纬度”：50.87979，“经度”：5.93174]，
[“标题”：“埃索·阿默斯福尔特·尼尔迪斯特，里杰克斯威格A1诺兹伊德，公元3821年，阿默斯福尔特”，“纬度”：52.205585，“经度”：5.3844]，
[“标题”：“埃索·阿姆斯特尔文，乌德克尔凯兰1501185 AG，阿姆斯特尔文”，“纬度”：52.297044，“经度”：4.865962]，
[“标题”：“埃索·阿姆斯特尔文·贝内卢克斯班奥斯特，贝内卢克斯班10奥斯特，1183 ZZ，阿姆斯特尔文”，“纬度”：52.317709，“经度”：4.870159]，
[“标题”：“埃索快递阿姆斯特尔文-贝内卢克斯班西部，贝内卢克斯班9西部，1181 ZZ，阿姆斯特尔文”，“纬度”：52.317307，“经度”：4.869668]，
[“标题”：“埃索·维瑟斯·阿姆斯特拉德，霍默特韦格，上午292-26436，阿姆斯特拉德”，“纬度”：50.934569，“经度”：5.916655]，
[“标题”：“埃索阿姆斯特丹J诉哈塞尔特韦格，约翰·凡·哈塞尔特韦格731021千牛，阿姆斯特丹”，“纬度”：52.387029，“经度”：4.924821]，
[“标题”：“埃索阿姆斯特丹Marnixstraat，Marnixstraat 2501016TL，阿姆斯特丹”，“纬度”：52.369842，“经度”：4.877018]，
[“标题”：“埃索阿姆斯特丹米尔瓦特，米尔瓦特2011068洛杉矶，阿姆斯特丹”，“纬度”：52.35523，“经度”：4.81045]，
[“标题”：“埃索阿姆斯特丹萨法提斯特拉特，萨法提斯特拉特225，1018 AE，阿姆斯特丹”，“纬度”：52.36685，“经度”：4.92415]，
[“标题”：“埃索阿姆斯特丹彼特卡兰，彼特卡兰兰891065KK，阿姆斯特丹”，“纬度”：52.3559，“经度”：4.82452]，
[“标题”：“埃索阿姆斯特丹乌得勒支布鲁格，纽韦乌得勒支韦格1096 CK，阿姆斯特丹”，“纬度”：52.33214，“经度”：4.91194]，
[“标题”：“德士古阿姆斯特丹Kollenbergweg，Kollenbergweg 11，1101 AR，阿姆斯特丹Zuidoost”，“纬度”：52.305681，“经度”：4.934042]，
[“标题”：“埃索·阿佩尔多恩，里克斯威格A50 westzijde，7372 BJ，阿佩尔多恩”，“纬度”：52.169628，“经度”：6.024606]，
[“标题”：“火区阿佩尔多恩-埃迪森兰，埃迪森兰270，7316 JL，阿佩尔多恩”，“纬度”：52.2305509，“经度”：5.9604756]，
[“标题”：“火区阿佩尔多恩-兰-凡-泽文，兰-凡-泽文胡赞3967322西北，阿佩尔多恩”，“纬度”：52.2207337，“经度”：5.9985234]，
[“标题”：“埃索·阿平格丹，Farmsumerweg 609902英国电信，阿平格丹”，“纬度”：53.319883，“经度”：6.870897]，
[“标题”：“埃索阿纳姆艾瑟鲁德韦格，艾瑟鲁德韦格426825勒阿纳姆”，“纬度”：51.9786