我正在尝试为我的用户实现JWT。尝试注册时，我总是收到一条错误消息，提示已经有使用相同电子邮件的用户。即使我在空白的用户表上运行。
用户创建一次，所以我不知道问题出在哪里。我正在邮递员中尝试这个。
这里有什么想法
<!-- Navbar -->
<nav class="navbar navbar-light navbar-expand-md bg-dark">
<a href="#" class="navbar-brand"><i class="fas fa-child text-warning fa-2x"></i></a>
<button type="button" class="navbar-toggler bg-light" data-toggle = "collapse" data-target ="#nav">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse justify-content-between" id="nav">
<ul class="navbar nav">
<li class = "nav-item">
<a class="nav-link text-light font-weight-bold text-uppercase px-3" href="#">Home</a>
</li>
<li class = "nav-item">
<a class="nav-link text-light font-weight-bold text-uppercase px-3" href="#">Skills</a>
</li>
<li class = "nav-item dropdown" data-toggle = "dropdown">
<a class="nav-link text-light font-weight-bold text-uppercase px-3 dropdown-toggle" href="#">Projects</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Project 1</a>
<a class="dropdown-item" href="#">Project 2</a>
<a class="dropdown-item" href="#">Project 3</a>
<a class="dropdown-item" href="#">Project 4</a>
</div>
</li>
<li class = "nav-item">
<a class="nav-link text-light font-weight-bold text-uppercase px-3" href="#">Team</a>
</li>
<li class = "nav-item">
<a class="nav-link text-light font-weight-bold text-uppercase px-3" href="#">Contact</a>
</li>
</ul>
<form class="form-inline">
<div class="input-group">
<input type="text" name="" placeholder="Search" class="form-control">
</div>
<div class="input-group-append">
<button class="btn">
<i class="fas fa-search text-muted "></i>
</button>
</div>
</form>
</div>
</nav>
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