Re: EX3300 - Sub Interface (New to Junos)

I'm trying to apply the sub-interface but I'm getting the following:

[edit vlans Mail l3-interface]
'l3-interface vlan.25'
Interface must already be defined under [edit interfaces]
error: commit failed: (statements constraint check failed)

Mail {
vlan-id 25;
##
## Warning: Interface must already be defined under [edit interfaces]
##
l3-interface vlan.25;