orbitdb: Error: Non-base58 character

I am a beginner and I was trying to run the code in the docs

const IPFS = require('ipfs')
const OrbitDB = require('orbit-db')

const ipfs = new IPFS({
    repo:'./data',
    EXPERIMENTAL:{
        pubsub:true
    }
})
ipfs.once('ready',()=>{
    console.log('working')
    var orbitdb=new OrbitDB(ipfs)
    kv = orbitdb.kvstore('profile')
    kv.set('hello',100).then(()=>{
            console.log('hello')
        }).catch((error)=>{
            console.log(error)
        })
    }
    

)

This returned an error ‘TypeError: kv.set is not a function’ . Tried adding promise :

const IPFS = require('ipfs')
const OrbitDB = require('orbit-db')
const ipfs = new IPFS()
ipfs.on('ready', async () => {
  const orbitdb = new OrbitDB(ipfs)
  const db = await orbitdb.keyvalue('first-database')
  .catch((error)=>{
    console.log(error)
  })
})

The above code is returning : Error: Non-base58 character at Object.decode (D:\workspace\ipfs\orbit\node_modules\base-x\index.js:84:11) at Object.fromB58String (D:\workspace\ipfs\orbit\node_modules\multihashes\src\index.js:68:27) at Function.isValid (D:\workspace\ipfs\orbit\node_modules\orbit-db\src\orbit-db-address.js:22:74) at Function.parse (D:\workspace\ipfs\orbit\node_modules\orbit-db\src\orbit-db-address.js:36:25) at OrbitDB.create (D:\workspace\ipfs\orbit\node_modules\orbit-db\src\OrbitDB.js:214:38) at <anonymous>