Network Management

Good afternoon, everyone.
On the Aruba J9851A I did port mirroring using this instruction (Local mirroring using traffic-direction criteria)

https://support.hpe.com/techhub/eginfolib/networking/docs/switches/K-KA-KB/15-18/5998-8160_ssw_mcg/content/ch11s52.html

I wrote:
conf t
mirror 3 port 1/J5
interface 2/H17
monitor all both mirror 3

Mirroring works, but now I need to disable it. How do I do that?

I have tried this:
conf t
interface 2/H17
no monitor all both mirror 3
exit
no mirror 3

After the last command I get a message:
Policy with this mirror is applied on vlan/interface.

But when I run the command, it shows me the following:

Aruba# show running-config | include mirror 3
mirror 3 port 1/J5

Aruba(config)# no mirror 3
Policy with this mirror is applied on vlan/interface.

Aruba(eth-1/J5)# no monitor all both mirror 3
Mirror Session 3 is not assigned to 1/J5 in direction 'Both'.

I think you are trying to remove the mirroring configuration on port 1/J5 of your 5412 switch. It appears you have removed all monitoring from ports/vlans which would use the mirror 3 configuration. 

What does the output of 'show monitor' and 'show monitor 3' give you?