enable the two commands in ASR 900 :xml agent tty netconf agent tty

[Dhikra Marghli]

Hello

i have  901-903-ME 3800  and i want enable these two commands : xml agent tty  netconf agent tty

but i can't 

how i can enable  the two commands in ASR 900 :

xml agent tty

netconf agent tty

i try  to put but i can't

ASR901-KHETMINE(config)#xml agent tty
^
% Invalid input detected at '^' marker.

ASR901-KHETMINE(config)#
ASR901-KHETMINE(config)#netconf agent tty
^
% Invalid input detected at '^' marker.

ASR901-KHETMINE(config)#end

i wait a reply from  expert network help me

thanks 

[Dhikra Marghli]

I  WAIT A reply urgent .. and a answer ..

thanks