asa, configure interface

why i can not configure nameif and ip address under interface ethernetx/y. This the output :
ciscoasa(config)# interface ethernet 0/0
ciscoasa(config-if)# nameif
^
ERROR: % Invalid input detected at '^' marker.
ciscoasa(config-if)# nameif ?
ERROR: % Unrecognized command
ciscoasa(config-if)# ip add
ciscoasa(config-if)# ip add
^
ERROR: % Invalid input detected at '^' marker.
ciscoasa(config-if)#


I'm very confused because in my lab i can configure thats.

I need help in this forum..

Thanks
Jerri

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