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Welcome to /r/1710forlife! For fixing this error (and other world errors), what you may be referring to is not Worldedit but MCEdit - it is a standalone application for editing .mca world files, can be found here: http://www.mcedit.net

However, there is another option to try. Go to your configuration directory and open forge.cfg, look for these options:

# Set this to true to remove any Entity that throws an error in its update method instead of closing the server and reporting a crash log. BE WARNED THIS COULD SCREW UP EVERYTHING USE SPARINGLY WE ARE NOT RESPONSIBLE FOR DAMAGES. B:removeErroringEntities=false

# Set this to true to remove any TileEntity that throws an error in its update method instead of closing the server and reporting a crash log. BE WARNED THIS COULD SCREW UP EVERYTHING USE SPARINGLY WE ARE NOT RESPONSIBLE FOR DAMAGES. B:removeErroringTileEntities=false

temporarily change to true then load the game. If all goes well, the erroring entities should be automatically removed. I used this option in my world when I had a similar error and it did the job (and I left it on now that think of it, despite the warning), but YMMV.

If the removeErroringEntities/removeErroringTileEntities configs don't fix it, definitely try MCEdit. Go to the coordinates where the erroring entities are found then delete them, or I believe you can also do a mass edit find/replace (but I have not tried it myself).