help! example from wiki doesn't work - why? invalid internal item number

RouterOS Scripting
1 
{
:local address1 [/ip address get [find interface="ether1"] address]
:put $address1
}
invalid internal item number
2

OK, I figured this one out, but why is the other example in the Manual/wiki???

DOES WORK:

{
:local address1 [/ip address get [/interface ethernet find name=ether1] address]
:put $address1
}