Question So WorldEdit screwed up.

Yeah not exactly sure how to fix this?

Code:

Caused by: java.lang.AbstractMethodError
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.getFullBlock(AbstractDelegateExtent.java:75) ~[?:?]
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.getFullBlock(AbstractDelegateExtent.java:75) ~[?:?]
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.getFullBlock(AbstractDelegateExtent.java:75) ~[?:?]
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.getFullBlock(AbstractDelegateExtent.java:75) ~[?:?]
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.getFullBlock(AbstractDelegateExtent.java:75) ~[?:?]
    at com.sk89q.worldedit.extent.ChangeSetExtent.setBlock(ChangeSetExtent.java:66) ~[?:?]
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.setBlock(AbstractDelegateExtent.java:80) ~[?:?]
    at com.sk89q.worldedit.extent.MaskingExtent.setBlock(MaskingExtent.java:69) ~[?:?]
    at com.sk89q.worldedit.extent.AbstractDelegateExtent.setBlock(AbstractDelegateExtent.java:80) ~[?:?]
    at com.sk89q.worldedit.extent.validation.BlockChangeLimiter.setBlock(BlockChangeLimiter.java:87) ~[?:?]
    at com.sk89q.worldedit.EditSession.setBlock(EditSession.java:615) ~[?:?]
    at com.sk89q.worldedit.EditSession.setBlock(EditSession.java:658) ~[?:?]
    at com.sk89q.worldedit.function.block.BlockReplace.apply(BlockReplace.java:53) ~[?:?]
    at com.sk89q.worldedit.function.RegionMaskingFilter.apply(RegionMaskingFilter.java:53) ~[?:?]
    at com.sk89q.worldedit.function.visitor.RegionVisitor.resume(RegionVisitor.java:57) ~[?:?]
    at com.sk89q.worldedit.function.operation.Operations.completeLegacy(Operations.java:55) ~[?:?]
    at com.sk89q.worldedit.EditSession.replaceBlocks(EditSession.java:994) ~[?:?]
    at com.sk89q.worldedit.command.RegionCommands.replace(RegionCommands.java:167) ~[?:?]
    ... 32 more

 

Have you tried re-installing the plugin?