Worldedit Failz! :(

Yo, Forcestaken here,
Recently I opened my Mc server to keep up my creative town, but then something really odd happend:

When I set a region and then did //set 25 Worldedit gave me this error message:
java.lang.NoSuchMethodError: org.bukkit.block.NoteBlock.getNote()B

Any Help would be appreciated

Peace
-Forcestaken