Oddity in rxplot

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Hi..

I try to "rxplot" but the rxplot does not show anything in window.. I have made "rostopic echo /kirim_ke_servo" to see the data

name: ['joint1', 'joint2', 'joint3']

position: [-0.6512382961093546, -0.19887827975841985, 1.568777172497011]

velocity: [0.5, 0.5, 0.5]

So, I try to "rxplot /kirim_ke_servo/position" in terminal

rizqa@ubuntu:~$ rxplot /kirim_ke_servo/position

[/kirim_ke_servo/position] value was not numeric: (-0.8225104223257155, -0.07641244134696615, 1.755642665868377)

In terminal appear the data.. but rxplot does not display anything How fix the problem ?