Bootstrap navbar hamburger menu not responding after click

When I view my website on mobile, though the hamburger menu appears, it doesn't respond after clicking. I am not sure what's wrong with my code.

<nav class="navbar navbar-expand-lg navbar-light bg-light">
        <a class="navbar-brand wc" href="">our association</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="list" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarNav">
            <ul class="navbar-nav">
                <li class="nav-item">
                    <a class="nav-link wc navb-it" href="">About</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link wc dropbtn navb-it" href="#">stuff1</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link wc navb-it" href="#">stuff2</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle wc navb-it" href="#" id="navbarDropdown">Event</a>
                    <div class="dropdown-menu mt-0" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" href="#">2020 Hackathon</a>
                        <a class="dropdown-item" href="#">Coding Challenges</a>
                </li>
            </ul>
            <ul class="navbar-nav ml-auto">
                
                <li class="nav-item">
                    <a class="nav-link wc navb-it" href="">Log in</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link wc navb-it" href="">Register</a>
                </li>
                
            </ul>
        </div>
    </nav>

At the beginning it didn't appear at all, that was because I didn't add a bootstrap color scheme to the navbar. Now, even though it shows, the menu bar in the mobile view doesn't work when clicking. Thank you.