PLEASE HELP "CAR TURN SIGNAL SCRIPT"

The script gives this error. I couldn’t solve it, can you help me?

ERROR : Assets\Scripts\signal.cs(54,53): error CS1001: Identifier expected
ERROR : Assets\Scripts\signal.cs(63,53): error CS1001: Identifier expected

These are the wrong lines :

(54,53) : yield WaitForSeconds(indicatorDelayBetweenFlashes); //Delay between flashes of indicator
(63,53) : yield WaitForSeconds(indicatorDelayBetweenFlashes); //Delay between flashes of indicator

SCRIPT:


using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class signal : MonoBehaviour
{

public bool leftIndicatorEnabled = false; //If the left indicator is on
public bool rightIndicatorEnabled = false; //If the right indicator is on
private float indicatorDelayBetweenFlashes = 0.5f; //Delay between indicator flashes
public float leftIndicatorLight; //Set these to your lights
public float rightIndicatorLight; //Set these to your lights

void Update()
{
	//Left indicator
	if (Input.GetKeyDown(KeyCode.U)) //Left indicator button pressed
	{
		if (!leftIndicatorEnabled) //Is the indicator currently off?
		{
			rightIndicatorEnabled = false; //Turn off the right indicator
			leftIndicatorEnabled = true; //Turn the left indicator on
			LeftIndicatorFlasher(); //Flash the indicator
		}
	}
	else //Indicator is on, lets turn if off.
	{
		leftIndicatorEnabled = false; //Turn off the left indicator
		leftIndicatorLight.enabled = false; //Ensure the light is off
	}

	//Right Indicator
	if (Input.GetKeyDown(KeyCode.I)) //Right indicator button pressed
	{
		if (!rightIndicatorEnabled) //Is the indicator currently off?
		{
			leftIndicatorEnabled = false; //Turn off the left indicator
			rightIndicatorEnabled = true; //Turn the right indicator on
			RightIndicatorFlasher(); //Flash the indicator
		}
	}
	else //Indicator is on, lets turn if off.
	{
		rightIndicatorEnabled = false; //Turn off the right indicator
		rightIndicatorLight.enabled = false; //Ensure the light is off
	}
}

void LeftIndicatorFlasher()
{
	while (leftIndicatorEnabled) //Loop until we turn the indicator off
	{
		leftIndicatorLight.enabled = !leftIndicatorLight.enabled; //Switch light from enabled to disabled and back again
		yield WaitForSeconds(indicatorDelayBetweenFlashes); //Delay between flashes of indicator
	}
}

void RightIndicatorFlasher()
{
	while (rightIndicatorEnabled) //Loop until we turn the indicator off
	{
		rightIndicatorLight.enabled = !rightIndicatorLight.enabled;  //Switch light from enabled to disabled and back again
		yield WaitForSeconds(indicatorDelayBetweenFlashes); //Delay between flashes of indicator
	}
}

}

If you check the Documentation (always recommended, always a good idea) it will tell you that the syntax must be:

  yield return new WaitForSeconds(someTime);