Xcode if statement within if statement not working : I need to have an if statement inside an if statement and cant quite get it to work - keep getting an error - expected expression.

The below code is what i've tried:
```         
if weightLabel.text == "Weight (lbs)" {
            if pickerView == heightPicker {
                let titleRow = height[row]
                return titleRow
            }
            else if pickerView == weightPicker {
                let titleRow = weight[row]
                return titleRow
            }
            return ""
        else if weightLabel.text == "Weight (kgs)" {
            if pickerView == heightPicker {
                let titleRow = heightCM[row]
                return titleRow
            }
            else if pickerView == weightPicker {
                let titleRow = weightKG[row]
                return titleRow
            }
            return ""
            }
    }
```

Can someone take a look at my current code and help?