Getting error while finding element from popup window

Question

at executionEngine.ScriptTest.main(ScriptTest.java:28)

Caused by: org.openqa.selenium.InvalidSelectorException: The given selector button radius secondary borderless is either invalid or does not result in a WebElement. The following error occurred:

InvalidSelectorError: Compound class names not permitted

For documentation on this error, please visit: http://seleniumhq.org/exceptions/invalid_selector_exception.html

Build info: version: 'unknown', revision: 'unknown', time: 'unknown'

Comments

Can you post your code using which you are identifying an element?

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driver.findElement(By.id("simplePopup")).findElement(By.className("button radius secondary borderless")).click();

Answer 1

Okay. className can not have spaces. 

This is wrong

By.className("button radius secondary borderless")

Instead use CSS selector or xPath. Also, see if you can use name, linkedText or partialLinkedText. I assume that you do not have unique ID.