Get "invalid selector: Unable to locate an element with the xpath expression" after upgrade from 6.15.1 to 6.16

[saratoga8]

Meta -

Watir Version: 6.16
Selenium Version: 3.141
Browser Version: Chrome 70.0.3538.77
Browser Driver Version: chromedriver=2.45.615279
OS Version: Linux 4.15.0-42-generic x86_64

Expected Behavior -

The text fields 'USERNAME' and 'PASSWORD' should be filled by text of the site https://app.evrideo.com/login/     (see Steps to reproduce)

Actual Behavior -

/home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/response.rb:69:in assert_ok': invalid selector: Unable to locate an element with the xpath expression ()[1]//*[local-name()='input'][@id='username'] because of the following error: (Selenium::WebDriver::Error::InvalidSelectorError) SyntaxError: Failed to execute 'evaluate' on 'Document': The string '()[1]//*[local-name()='input'][@id='username']' is not a valid XPath expression. (Session info: chrome=70.0.3538.77) (Driver info: chromedriver=2.45.615279 (12b89733300bd268cff3b78fc76cb8f3a7cc44e5),platform=Linux 4.15.0-42-generic x86_64) from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/response.rb:32:in initialize'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/http/common.rb:84:in new' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/http/common.rb:84:in create_response'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/http/default.rb:104:in request' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/http/common.rb:62:in call'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/bridge.rb:166:in execute' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/oss/bridge.rb:584:in execute'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/remote/oss/bridge.rb:552:in find_element_by' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/selenium-webdriver-3.141.0/lib/selenium/webdriver/common/search_context.rb:60:in find_element'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/locators/element/locator.rb:56:in locate_element' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/locators/element/locator.rb:34:in matching_elements'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/locators/element/locator.rb:18:in locate' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:741:in locate_in_context'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:612:in locate' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:729:in assert_exists'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:65:in exists?' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait.rb:216:in block in create_proc'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait.rb:43:in block in until' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait.rb:87:in block in run_with_timer'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait/timer.rb:19:in block in wait' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait/timer.rb:18:in loop'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait/timer.rb:18:in wait' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait.rb:86:in run_with_timer'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait.rb:42:in until' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/wait.rb:125:in wait_until'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:677:in wait_for_exists' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:701:in wait_for_enabled'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:713:in wait_for_writable' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:838:in check_condition'
from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:800:in element_call' from /home/daniel/.rvm/gems/ruby-2.5.3/gems/watir-6.16.1/lib/watir/elements/element.rb:338:in send_keys'
from support/bug.rb:9:in `

'

Steps to reproduce -

Example's code:

 require 'watir'

browser = Watir::Browser.new

browser.goto 'https://app.evrideo.com/login/'
browser.wait
root = browser.element(css: '.main-container section ichannel-login-form')

root.input(id: 'username').send_keys("usr")
root.input(id: 'password').send_keys("pwd")

browser.close

[titusfortner]

Classic YAGNI. I was (am?) trying to walk the line of not making the implementation "XPath specific" for the extensions which caused me to miss this scenario in 6.16. I think I have the fix, and I'll try to get a point release out quickly. Thanks for the report.

[titusfortner]

Fixed in 6.16.2