GPU temp retain trigger doesn't work

[mahan]

sorry, I'm a noob.
Do you mean these commands?!

Code:

nvidia-settings -a GPUFanControlState=1
nvidia-settings -a GPUTargetFanSpeed=100

Output:

Code:

mahan@M:~$ nvidia-settings -a GPUFanControlState=1

     Attribute 'GPUFanControlState' (M:0[gpu:0]) assigned value 1.

mahan@M:~$ nvidia-settings -a GPUTargetFanSpeed=100

     Attribute 'GPUTargetFanSpeed' (M:0[fan:0]) assigned value 100.

ERROR: Error assigning value 100 to attribute 'GPUTargetFanSpeed' (M:0[fan:1])
      as specified in assignment 'GPUTargetFanSpeed=100' (Unknown Error).

it sets the value and fans are working perfectly, but what's that error?
how to fix it?