worldedit craftscript getOrigin problem

importPackage(Packages.com.sk89q.worldedit);
importPackage(Packages.com.sk89q.worldedit.blocks);

var blocks = context.remember();
var session = context.getSession();

var cb = session.getClipboard();
var cbOrigin = cb.getOrigin();

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TypeError: Cannot find function getOrigin in object com.sk89q.worldedit.session.ClipboardHolder@67bf593f. (plugins\WorldEdit\craftscripts\exit.js#8) in plugins\WorldEdit\craftscripts\exit.js at line number 8

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This server is running CraftBukkit version git-Spigot-c46583f-0643caa (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT)
[WorldEdit] Loading WorldEdit v6.0.2-SNAPSHOT;3352-121d77cc