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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/site/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/site/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/site/index.php
Line: 315
Function: require_once

When i use console.log to print allbu[i].classList[i] it print only first element class right and all other class name are shown undefined i made this website to change the color of button but due to this problem i am not able to complete this project if you what is solution of this problem please help me int his

var allbu = document.getElementsByTagName('button');    var buttoncopy = []  for (let i = 0; i < allbu.length; i++) {    buttoncopy.push(allbu[i].classList[i]);  }  console.log(buttoncopy);    function buchange(btc) {    if (btc.value == 'red') {      btcred();    } else if (btc.value == 'blue') {      btcblue();    } else if (btc.value == 'green') {      btcgreen();    }  }    function btcred() {    for (let i = 0; i < allbu.length; i++) {      allbu[i].classList.remove(allbu[i].classList[i]);      allbu[i].classList.add('redbu');    }  }    function btcblue() {    for (let i = 0; i < allbu.length; i++) {      allbu[i].classList.remove(allbu[i].classList[i]);      allbu[i].classList.add('bluebu');    }  }    function btcgreen() {    for (let i = 0; i < allbu.length; i++) {      allbu[i].classList.remove(allbu[i].classList[i]);      allbu[i].classList.add('greenbu');    }  }
#con {    border: 1px solid black;    padding: 10px;    width: 65%;    margin: 0 auto;    display: flex;    flex-direction: column;    justify-content: space-around;    text-align: center;  }    #con1 {    border: 1px solid black;    flex-wrap: wrap;    display: flex;    flex-direction: row;    justify-content: space-around;    padding: 5px;  }    button {    background-color: #4CAF50;    /* Green */    border: none;    color: white;    padding: 15px 32px;    text-align: center;    text-decoration: none;    display: inline-block;    font-size: 16px;  }    select {    margin-top: 20px;  }    .redbu {    background-color: red;  }    .bluebu {    background-color: royalblue;  }    .greenbu {    background-color: #4CAF50;  }    .yellowbu {    background-color: yellow;  }
        Button Color              

Change button Color

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