When a selector cannot be located, we currently print wait for selector didn't resulted in any nodes. When it happens, it is very useful to know which selector the error message refers to.

A simple fix that also corrects the grammar (resulted -> result):

return nil, errors.New("wait for selector didn't result in any nodes. selector: " + selector)

As this will likely be a very common exception, it may be worth thinking about what else we can include in it, such as a suggestion for why an element may not have been found.