Problems with the key name of a trigger

[Furiwel]

The thing is that Im trying to put a trigger that tell me when the cpu load its higher than 30%.
My host name its 186.30.36.5
And the item name its ActivadoHistorico_1: Type:Zabbix trapper

so I put:
{186.30.36.5:ActivadoHistorico_1.cpu.load.last(0)} >30

And gave me this error:
Incorrect item key "186.30.36.5:ActivadoHistorico_1.cpu.load" provided for trigger expression.

Thank you

[frankymryao]

what is 'ActivadoHistorico_1'? I think '186.30.36.5' is your hostname and 'cpu.load' is your item name, isn't it?

try {186.30.36.5:cpu.load.last(0)} >30