I can not find a way to capture an alert

What about friends, I am trying to capture a fin or better said pop-ups with the following code.

WebUI.waitForAlert(30)

BufferedImage image = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()))

ImageIO.write(image, ‘png’, new File(‘C:\\yourImage.png’))

but you are showing me the following error

groovy.lang.GroovyRuntimeException: Could not find matching constructor for: org.openqa.selenium.Rectangle(java.awt.Dimension)

I’m using these libraries

import static com.kms.katalon.core.checkpoint.CheckpointFactory.findCheckpoint

import static com.kms.katalon.core.testcase.TestCaseFactory.findTestCase

import static com.kms.katalon.core.testdata.TestDataFactory.findTestData

import static com.kms.katalon.core.testobject.ObjectRepository.findTestObject

import com.kms.katalon.core.checkpoint.Checkpoint as Checkpoint

import com.kms.katalon.core.checkpoint.CheckpointFactory as CheckpointFactory

import com.kms.katalon.core.mobile.keyword.MobileBuiltInKeywords as MobileBuiltInKeywords

import com.kms.katalon.core.mobile.keyword.MobileBuiltInKeywords as Mobile

import com.kms.katalon.core.model.FailureHandling as FailureHandling

import com.kms.katalon.core.testcase.TestCase as TestCase

import com.kms.katalon.core.testcase.TestCaseFactory as TestCaseFactory

import com.kms.katalon.core.testdata.TestData as TestData

import com.kms.katalon.core.testdata.TestDataFactory as TestDataFactory

import com.kms.katalon.core.testobject.ObjectRepository as ObjectRepository

import com.kms.katalon.core.testobject.TestObject as TestObject

import com.kms.katalon.core.webservice.keyword.WSBuiltInKeywords as WSBuiltInKeywords

import com.kms.katalon.core.webservice.keyword.WSBuiltInKeywords as WS

import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUiBuiltInKeywords

import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI

import internal.GlobalVariable as GlobalVariable

import org.openqa.selenium.Keys as Keys

import java.awt.Robot as Robot

import java.awt.Toolkit as Toolkit

import java.awt.image.BufferedImage as BufferedImage

import javax.imageio.ImageIO as ImageIO

import org.openqa.selenium.Rectangle as Rectangle

I am urgently could you help me!!