Let`s Encrypt error 504 after yesterdays update

Yesterday is used the Let`s Encrypt extension for a few websites wich was working perfectly. Today I want to create a new certificate for a website and it gave an error. I noticed it is possible now to secure website with Let`s Encrypt, a feature that I was waiting for and very happy to see. Although this new feature is great, since the Let`s Encrypt extension updated, I get this error:

Error: Let's Encrypt SSL certificate installation failed: Could not obtain directory: Invalid response:...

Let`s Encrypt error 504 after yesterdays update