Originally posted by Kenny:

i tryied to use an extractor but when i do, a message saying "you can't use dvergr extractor on ancient root" appears.. but it says that "the ancient root is pulsating with energy".

ok i now know how to do. you have to place a "sap extractor" with your hammer!

Sounds to me like you are trying to extract from an Ancient Root and from what I read those can't be destroyed or get sap from you need a Dvergr Root