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I recently wanted to make a force field so that some players can't access the area above this force field, and for this, I've made this command (on picture) and here is what it says: enter image description here

I don't understand what is wrong in my command; unless it is the system ?

enter image description here

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    I see you are playing 1.9. Please remove the redstone clock and set the command block to "repeat" instead. This way, you prevent redstone lag, which can cause problems if you have a lot of clocks like this. – MrLemon Apr 22 '16 at 17:08
  • Thank you very much for this, it is real that I hate redstone lags :) – Kimatuy Apr 23 '16 at 0:49
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It looks like your command is /tp @a [x=-3,y=1,z=0,dx=-9,dy=7,dz=0] ~ ~ ~-1

I see one error with this: you need to have the @a and [ touching.

Fixed command:

/tp @a[x=-12,y=1,z=0,dx=9,dy=7,dz=0] ~ ~ ~-1

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    Your second point is incorrect; delta parameters may be negative and 0. – Skylinerw Apr 22 '16 at 17:07
  • How do they work with 0? – ash4fun Apr 22 '16 at 18:03
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    It targets players at the same blockspace as the specified coordinates. Otherwise it's the number of blocks in the specified direction from the coordinates (such as a value of dx=1 encompassing 2 blocks; the origin and 1 block in the X direction). – Skylinerw Apr 22 '16 at 18:05
  • It going ever worse; the little line that appear after the command is run don't even do now (I'm not saying for the comment but for the answer) – Kimatuy Apr 23 '16 at 1:02
  • If I understand your complaint correctly, then I, too, encounter this problem. It seems to happen only on command blocks set to 'always active'. try setting it to impulse on a clock, and see if that works. – ash4fun Apr 23 '16 at 12:46

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