Create Selenium Tests in ReadyAPI

How to Create Selenium Tests in ReadyAPI?. Getting error. Not sure where it went wrong.

I followed the steps in below link.

https://support.smartbear.com/readyapi/docs/integrations/selenium/integrate.html

Getting below error when I have tried sample code in Groovy scripts.

Snippet:

import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.By;

System.setProperty("webdriver.chrome.driver", "C:/Program Files/SmartBear/ReadyAPI-3.42.1/bin/ext/chromedriver.exe");

def driver = new ChromeDriver()

// Navigate to the ReadyAPI documentation
driver.get("https://support.smartbear.com/readyapi/docs/")

// Enter the search string
def searchbox = driver.findElement(By.id("inputSearchBox"));
searchbox.sendKeys("Groovy");

// Command to search for the typed text
def searchbtn = driver.findElement(By.id("btnSearch"));
searchbtn.click();

// List suggestions
def allSuggestions = driver.findElements(By.xpath("//div[@id='search_results_container']/div/h5/a"))
for (def suggestion : allSuggestions)
{
if(suggestion.getAttribute('href') != '')
log.info(suggestion.getAttribute('href'))
else
log.error('The test failed.')
}
// Close the browser
driver.quit();

Error:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Script4.groovy: 7: unable to resolve class ChromeDriver
@ line 7, column 14.
def driver = new ChromeDriver()
^
org.codehaus.groovy.syntax.SyntaxException: unable to resolve class ChromeDriver
@ line 7, column 14.