Unable to create trigger with feed

I am using code from the example provided.
```const params = {cron: '*/8 * * * * *', trigger_payload: {name: 'James'}}
const name = '/whisk.system/alarms/alarm'
const trigger = 'alarmTrigger'
ow.feeds.create({name, trigger, params}).then(package => {
console.log('alarm trigger feed created')
}).catch(err => {
console.error('failed to create alarm trigger', err)
})
```
The error i get is "Resource representation is only available with these types: text/html; charset=UTF-8"