It doesn't work if i use

 xpath => '//a[@class="kl"][1]'
[download]

(i get exactly the same error).
But it works when i use

 xpath => '//input[@class="gbqfif"]'
[download]

which is a unique element in the page.
The result is perfect : 2 seconds or less instead of 5 or 6! Thank you so much!

I hope you're having good times :o)