world corrupter using scoreboard commands

So i was playing around with the scoreboards and i thought i could use an entity, such as a creeper, with a custom name as an entity for scoreboard data. i was hoping i could name the creeper "Example" and then be able to display to the sidebar something like: "Example: 1337" this would be really cool in my opinion but it didnt work.

what turned out happening was, i think, a world corruption. it was on a server that i am running locally but when i tried to log in it would say "Internal Exception: io.netty.handler.codec.DecoderException: java.io.IOException: The received string length is longer than the maximum allowed (36 > 16)"

Steps to Reproduce:
1. Name a creeper egg "Example"
2. Spawn that creeper
3. type the command "/scoreboard players set @e[type=Creeper] dummy 1337