What is wrong with this /testfor command

Question

I have a command block with the following command:

/testfor @p[x=35,y=21,z=3,score_Class=0]

When I power the command block it will output to a comparator if Class = 0 regardless of the players co-ordinates.

The command block seems to totally disregard the first 3 statements. Any help?

Thanks,

Alpha

Answer 1

im having a similar problem but instead of always outputting it never outputs, i do

 

/testfor @p[x=0,y=14,z=-35,r=10,name=Jacky500]

and it outputs: the entity UUID provided is in invalid format.

 

but you don't need the name radius or negative # for it to output that error