javascript - HTML, CSS, JS Script error. Error Interpretting Stack -


i working on to-do list application using firebase, error script error. error interpreting stack. has no obvious meaning, don't know think.

i tried commenting out of js still got same result. heard external link, adding crossorigin=anonymous didn't help.

all code worked me before, error new me.

var config = {    apikey: "aizasybiv0dppiwuzadvgfmkipf7gsykivt8n4m",    authdomain: "to-do-332c9.firebaseapp.com",    databaseurl: "https://to-do-332c9.firebaseio.com",    projectid: "to-do-332c9",    storagebucket: "to-do-332c9.appspot.com",    messagingsenderid: "281739919235"  };  firebase.initializeapp(config);    const txtemail = document.getelementbyid('txtemail');  const txtpassword = document.getelementbyid('txtpassword');  const btnlogin = document.getelementbyid('btnlogin');  const btnsignup = document.getelementbyid('btnsignup');  const btnlogout = document.getelementbyid('btnlogout');    var ref = firebase.database().ref('');    btnlogin.addeventlistener('click', e => {      document.getelementbyid('form').classlist.add('hide');          const email = txtemail.value;    const pass = txtpassword.value;    const auth = firebase.auth();      const promise = auth.signinwithemailandpassword(email, pass);    promise.catch(e => console.log(e.message));        ref = firebase.database().ref('');  });    btnsignup.addeventlistener('click', e => {    const email = txtemail.value;    const pass = txtpassword.value;    const auth = firebase.auth();      const promise = auth.createuserwithemailandpassword(email, pass);    promise.catch(e => console.log(e.message));    });    firebase.auth().onauthstatechanged(firebaseuser => {    if (firebaseuser) {      btnlogout.classlist.remove('hide');      document.getelementbyid('form').classlist.add('hide');        } else {      btnlogout.classlist.add('hide');      document.getelementbyid('messagestitle').classlist.add('hide');    }  });
.container {    width: 70%;    height: 100%;    background: #87b5ff;    margin: 10% auto;    color: #fff;    padding: 20px;    border-radius: 10px;    max-width: 400px;  }    #signin {    margin: auto;    padding-top: 10px;  }    .hide {    display:none;  }
<!doctype html>  <html>    <head>      <meta charset="utf-8">      <meta name="viewport" content="width=device-width, initial-scale=1">      <title>to-do</title>      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoiresju2yc3z8gv/npezwav56rsmlldc3r/azzgrngxqqknkkofvhfqhnuweyj" crossorigin="anonymous">      <link rel="stylesheet" href="style.css">    </head>    <body>      <div id="form" class="container">        <h3>login</h3>        <form id="signin">          <input type="email" class="form-control" id="txtemail" placeholder="email">          <input type="password" class="form-control mb-3" id="txtpassword" placeholder="password">        </form>        <button id="btnlogin" class="btn btn-primary">login</button>        <button id="btnsignup" class="btn btn-success">sign up</button>        <button id="btnlogout" class="btn btn-info hide">logout</button>      </div>            <script src="https://www.gstatic.com/firebasejs/4.3.1/firebase.js"></script>      <script src="main.js"></script>    </body>  </html>


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