When doing a scoreboard operation such as:
scoreboard players operation @e[type=Pig,name=Piggy1] obj > @e[type=Pig] objIt will return an error
The entity UUID provided is in an invalid format
when there is more than one Pig around.
This happens with most every entity and every operation.
Edit:
It doesn't happen on players
Edit:
I did more testing and it gives an error when:
1) The first selector is a non-player entity
2) More than one entities of second selector are targeted (which includes players)
Comments 3
Probably because of the first comment. But it should get reopened, because you fixed the wrong command apparently
If it doesn't get reopened in the soon future, you can report it here: http://www.reddit.com/r/Mojira
Before you make a bugreport, please first make sure that your command is indeed correct, remove the quote behind the first selector