Swift: My custom UITableViewDataSource class thinks it does not conform to 'UITableViewDataSource' protocol

I checked a few more questions, the answers to which seem to be in the method declarations of the data source. However, I cannot find what is wrong with my method declarations.

Here is my class:

import UIKit

class GuestControl: UITableViewDataSource, UITableViewDelegate {
    @IBOutlet weak var leftTable: UITableView!
    @IBOutlet weak var rightTable: UITableView!
    var userList = [User]() //even numbers including 0 go on the left table, odd numbers go on the

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    //Here is where we link to that user contact page
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell: GuestTableViewCell = tableView.dequeueReusableCellWithIdentifier("guestCell") as! GuestTableViewCell

    if tableView == leftTable {
        cell.configureCellWithUser(userList[indexPath.row+indexPath.row])
    } else {
        cell.configureCellWithUser(userList[indexPath.row+indexPath.row+1])
    }

    return cell
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    let num = Double(userList.count) / 2.0
    if tableView == leftTable {
        return Int(round(num)) //round up
    } else {
        return Int(num) //round down
    }
}

      

        
        
        
      

    

}

And here is the exact error:

Protocol requires function 'tableView(_:numberOfRowsInSection:)' with type '(UITableView, numberOfRowsInSection: Int) -> Int'
Candidate is not '@objc', but protocol requires it
Protocol requires function 'tableView(_:cellForRowAtIndexPath:)' with type '(UITableView, cellForRowAtIndexPath: NSIndexPath) -> UITableViewCell'
Candidate is not '@objc', but protocol requires it

      

        
        
        
      

    

What's wrong?