java - How come I am getting InvalidSelectorException when trying to click a button using Selenium? -

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i new @ working selenium. trying click on following select button: enter image description here

here code:

import org.openqa.selenium.by; import org.openqa.selenium.webdriver; import org.openqa.selenium.webelement; import org.openqa.selenium.firefox.firefoxdriver;  public class firsttest  {     private static webdriver driver;      public static void main(string[] args) throws exception     {         driver = new firefoxdriver();         driver.manage().window().maximize();         driver.navigate().to("http://www.metro.ca/flyer/index.en.html");          webelement postalcodeinputbox = driver.findelement(by.name("postalcode"));         postalcodeinputbox.sendkeys("l6r1a1");         postalcodeinputbox.submit();          string pagesource = driver.getpagesource();         if(pagesource.contains("setstore btn"))             system.out.println("setstore btn found");          webelement selectbutton = driver.findelement(by.classname("setstore btn"));         selectbutton.click();     } }

picture confirming "setstore btn" in source: enter image description here

here "setstore btn" in source: enter image description here

it's caused trying search 2 separate classes in single by.classname(). "setstore" , "btn" each own classes.

try replacing 

webelement selectbutton = driver.findelement(by.classname("setstore btn"));

with

webelement selectbutton = driver.findelement(new byall(by.classname("setstore"), by.classname("btn")));

alternatively, https://stackoverflow.com/a/16090160/1055102 provides option.

webelement selectbutton = driver.findelement(by.cssselector(".setstore.btn"));

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