this is my app.js code going through a ipfs image uploader code along video by dapp university . facing this issue im new to blockchain i think there is a problem with this line of code const file = event.target.files[0]

captureFile(event) {

    event.preventDefault()

   const file = event.target.files[0]

    const reader = new window.FileReader()

    reader.readAsArrayBuffer(file)

    reader.onloadend = () => {

      this.setState({ buffer: Buffer(reader.result) })

      console.log('buffer', this.state.buffer)

    }

  }

onSubmit(event){

  event.preventDefault()

  console.log("on submit......")

  ipfs.default.files.add(this.state.buffer,(err, result)=>{

    if(err){

      console.err("belp")

      return

    }

   

     this.setState({ipfshash:result[0].hash})

     console.log("ipfshash",this.state.ipfshash)

  }) //api installed accessed in header

}

  render() {

    if (!this.state.web3) {

      return <div>Loading Web3, accounts, and contract...</div>;

    }

    return (

      <div className="App">

       

        <h1>IPFS UPLOADER DAPP!</h1>

        <p>THIS IMAGE IS STORED IN IPFS.</p>

        <img src ="" alt=""/>

        <h2>upload image:</h2>

       <form onSubmit={this.onSubmit} >

<input type='file' onChange={this.captureFile}/>

<input type='submit'/>

</form>

What error are you seeing for this line?