How to resolve 'Trigger campaign needs to have a 'Campaign Requested' trigger' when calling the 'Request Campaign' API

Hi,

I'm trying to run the Request Campaign API passing a campaign ID and it keeps on giving me the below error.

{
:   "requestId":"11aa6#16338e95b2f",
:   "success":false,
:   "errors":
:   [
:   :   {
:   :   :   "code":"1003",
:   :   :   "message":"Trigger campaign needs to have a 'Campaign Requested' trigger"
:   :   }
:   ]
}

Note that I have added a 'Campaign is Requested' trigger as explained in [1] but still it's giving me the same error. Can you please help me to figure out what I'm doing wrong?

[1] - http://developers.marketo.com/soap-api/campaigns/requestcampaign/

Regards,

Evanthika