UITableViewCell Delete Row Causing Index Out of Range – Ios swift

Here is my code :

    class SchedulerViewController: UIViewController, UITableViewDelegate, UITableViewDataSource,
    scheduleCellDelegate
    {
    
        
        var scheduleArray : Array<Array<String>>?
        var scheduler : [String : Array<Array<String>>]?
        var deviceID : String = ""
        let retrievedString = KeychainWrapper.standard.string(forKey: "token")
    
        var day = ""
        var dayNum = 0
      
        @IBOutlet weak var spinner: UIActivityIndicatorView!
        @IBOutlet var buttons: [UIButton]!
        @IBOutlet weak var scheduleView: UITableView!
        
        var header : HTTPHeaders? = nil
        var ScheduleURL : Dictionary<String, String>?
        
        override func viewDidLoad() {
            super.viewDidLoad()
            scheduleView.delegate = self
            scheduleView.dataSource = self
            spinner.isHidden = true
            //scheduleView.allowsSelection = false
            scheduleView.register(UINib(nibName: "schedulerCell", bundle: nil), forCellReuseIdentifier: "schedulerCell")
            self.getData()
            
        }
        
        func getData(){

                AFFunctions.getAFRequest(ofType: ScheduleResponse.self, url: ScheduleURL!["GET"]!) { responseData, statusCode in
                    print(responseData?.data?.scheduler, statusCode)
                    self.scheduler = responseData?.data?.scheduler
                    DispatchQueue.main.async {
        
                        self.scheduleView.reloadData()
                    }
                    
                }
            }
            
           
            var buttonNum : Int?
            
            @IBAction func daySelected(_ sender: UIButton) {
                
                self.buttons.forEach { $0.tintColor = ($0 == sender) ? UIColor.orange : UIColor.systemTeal }
                
                self.dayNum = sender.tag
                switch dayNum {
                case 0 : self.day = "Sunday"
                case 1 : self.day = "Monday"
                case 2 : self.day = "Tuesday"
                case 3 : self.day = "Wednesday"
                case 4 : self.day = "Thursday"
                case 5 : self.day = "Friday"
                case 6 : self.day = "Saturday"
                default : self.day = "Sunday"
           
            }
            showDetail(day : day,dayNum : dayNum)
        }
        
        func showDetail(day : String, dayNum : Int) {

            if let dayArray = scheduler?[day]
            {  
                scheduleArray = dayArray
                self.scheduleView.reloadData()
            } 
        }
        
        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return scheduleArray?.count ?? 0
        }
        
        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            
            let cell = Bundle.main.loadNibNamed("scheduleCell", owner: self, options: nil)?.first as! scheduleCell
            cell.cellDelegate = self
            cell.editBtn.tag = indexPath.row
            cell.deleteSchedule.tag = indexPath.row
            scheduleArray = scheduler![self.day]
/////////////THE BELOW STATEMENT THROWS THE ERROR ///////////////////
                if let firstLabel = self.scheduleArray?[indexPath.row][0], let secondLabel = self.scheduleArray?[indexPath.row][1] {
                DispatchQueue.main.async {
                        cell.timeLabel1.text = firstLabel
                        cell.timeLabel2.text = secondLabel
                    }
                }
            return cell
        }
        
        func didPressButton(_ tag: Int, btnType: String) {
            let deleteURL = K.delURL
            if(btnType == "delete") {
                AFFunctions.deleteAFRequest(ofType: scheduleResponse.self, url: "(deleteURL)?day=(self.day)&place=(tag)") { [self]
                    responseData, statusCode in
                    if(statusCode == 200){
                        let deleteAlert = UIAlertController(title: "Deleted", message: "Device Schedule Successfully Deleted", preferredStyle: UIAlertController.Style.alert)
    
                        deleteAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
                            
                            self.scheduler![self.day]?.remove(at: tag)
                            self.scheduleView.reloadData()
        
                         }))
                        self.present(deleteAlert, animated: true, completion: nil)
    
                    }
                }
            }
        }
     
    }

I am doing the changes in the array locally as data is fetched only once in ViewDidLoad() with getData function. It shows a schedule for each day of the week (7 buttons, one for each day, are linked to an Outlet Collection), with 2 buttons embedded in the custom cell nib – an edit button and a delete button. I have implemented the logic for deleting, button tags are equal to IndexPath.row which works perfectly and I am able to delete the values I want but when I can’t seem to get the table reload working. Even after deleting the row data, the table doesn’t update itself. I am calling reloadData after successful deletion. What am I doing wrong?