AShot().takeScreenshot - org.openqa.selenium.WebDriverException: unknown error: Cannot read property 'offset' of null

[sasikumar76]

public WebDriver driver;
System.setProperty("webdriver.chrome.driver","/Applications/webdriver/chromedriver");
driver = new ChromeDriver();

i) Screenshot myScreenshot = new AShot().takeScreenshot(driver,multiportal); // in Chrome
throws below error ,

ii) Below code works for me , but assert fails ,have attached the images for reference,

Screenshot myScreenshot = new AShot().coordsProvider(new WebDriverCoordsProvider()).takeScreenshot(driver);

But the when i compare 2 screenshots it shows diff. Note i have used same code to generate image and then comparing.

code snippet ,

ImageIO.write(myScreenshot.getImage(),"PNG", new File("/Applications/webdriver/newresult.png"));

	    BufferedImage expectedImage = ImageIO.read(new File("/Applications/webdriver/results.png"));
				
	//	BufferedImage actualImage = myScreenshot.getImage();
		
	    BufferedImage actualImage =     ImageIO.read(newFile("/Applications/webdriver/newresult.png"));
		ImageDiff diff = new ImageDiffer().makeDiff(actualImage, expectedImage);
		BufferedImage diffImage = diff.getMarkedImage();
		File outputfile = new File("/Applications/webdriver/diffImage.png");
		ImageIO.write(diffImage, "PNG", outputfile);
		Assert.assertFalse(diff.hasDiff());
	  
	Error for i) 

org.openqa.selenium.WebDriverException: unknown error: Cannot read property 'offset' of null
(Session info: chrome=63.0.3239.108)
(Driver info: chromedriver=2.34.522932 (4140ab217e1ca1bec0c4b4d1b148f3361eb3a03e),platform=Mac OS X 10.13.1 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 6 milliseconds
Build info: version: '2.52.0', revision: '4c2593c', time: '2016-02-11 19:06:42'
System info: host: 'mine', ip: "mine'', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.13.1', java.version: '1.8.0_77'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities [{applicationCacheEnabled=false, rotatable=false, mobileEmulationEnabled=false, networkConnectionEnabled=false, chrome={chromedriverVersion=2.34.522932 (4140ab217e1ca1bec0c4b4d1b148f3361eb3a03e), userDataDir=/var/folders/j_/f03djz4n2bv3j0swv_xy4glr59r0dp/T/.org.chromium.Chromium.6z7ZUS}, takesHeapSnapshot=true, pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true, hasTouchScreen=false, version=63.0.3239.108, platform=MAC, browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true, locationContextEnabled=true, webStorageEnabled=true, browserName=chrome, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true, setWindowRect=true, unexpectedAlertBehaviour=}]
Session ID: 28a02b04bf8feb97cafbe312ac022455
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:678)
at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:577)
at ru.yandex.qatools.ashot.util.JsCoords.findCoordsWithJquery(JsCoords.java:30)
at ru.yandex.qatools.ashot.coordinates.JqueryCoordsProvider.ofElement(JqueryCoordsProvider.java:13)
at ru.yandex.qatools.ashot.coordinates.CoordsProvider.ofElements(CoordsProvider.java:21)
at ru.yandex.qatools.ashot.AShot.takeScreenshot(AShot.java:115)
at ru.yandex.qatools.ashot.AShot.takeScreenshot(AShot.java:132)
at ExampleSel3.openApplication(ExampleSel3.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:774)
at org.testng.TestRunner.run(TestRunner.java:624)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:359)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312)
at org.testng.SuiteRunner.run(SuiteRunner.java:261)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1215)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
at org.testng.TestNG.run(TestNG.java:1048)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)

[sasikumar76]

selenium -3.8.1

ashot - 1.5.2 jar

[musiro77]

do you have a solution? I know it's long time

[valfirst]

@musiro77 could you please provide steps to reproduce?