How can i retrieve text from an element using nightwatch-cucumber

For a task assigned to me I need to be able to retrieve the text from an element.

Using google's homepage as an example, I wanted to retrieve the text attached to the search button and print it on my terminal just to compare with a value later, however the attached shows error message

How can i get it to just retrieve text from an element & print it? any ideas would be much appreciate, cheers all.

var int

Given(/^User is on google$/, () => {
   client.url('https://google.com')
   return client.waitForElementVisible('#tsf > div:nth-child(2) > div.A8SBwf > div.FPdoLc.tfB0Bf > center > input.gNO89b')
})
When(/^User inspects button it tells me the text$/, () => {
   client.getText('#tsf > div:nth-child(2) > div.A8SBwf > div.FPdoLc.tfB0Bf > center > input.gNO89b', function (result) {
   int = result.value
   console.log('result: '+ result)
   })
   return client.waitForElementVisible('#tsf > div:nth-child(2) > div.A8SBwf > div.FPdoLc.tfB0Bf > center > input.gNO89b')
})