From what I see the cause of the problem is actually stated in the "Reason" part of the problem description. You have upgraded avalon to a newer version but that version is not compatible with the internal services of AS you are using. The description is saying that it was trying to invoke a method that does not exist, thus the NoSuchMethodError exception happened.
You will need to downgrade the version to a compatible one. (Typically the point releases A.B.X are compatible but just fix bugs.)