Set property namespace in openwhisk wsk cli

I'm trying to create namespace in openwhisk along with auth and api host, but it's not working for me. The official documentation says to use this command. While `-i` is used to bypass the certificates.

```
wsk property -i set \
--apihost 'http://localhost:3233' \
--auth '23bc46b1-71f6-4ed5-8c54-816aa4f8c502:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCGuMDGIwP' \
--namespace 'guest'
```
It gives the error `unknown flag: --namespace` Next, I use it like this, but its still not setting the namespace.

```
wsk property -i set \
--apihost 'http://localhost:3233' \
--auth '23bc46b1-71f6-4ed5-8c54-816aa4f8c502:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCGuMDGIwP' \
namespace guest
```
It throws this error. error: `Unable to obtain API build information: The connection failed, or timed out. (HTTP status code 404)` How to fix this?