Route [/admin/update-pwd] not defined - laravel

Question

I am trying to change the admin password but it says: Route [/admin/update-pwd] not defined. How do I change it?
controller:
public function changepassword()
{
return view('admin.changepassword');
}
public function chkPassword(Request $request){
$data = $request->all();
$adminCount = Admin::where(['username' => Session::get('adminSession'),'password'=>md5($data['current_pwd'])])->count();
if ($adminCount == 1) {
echo "true"; die;
} else {
echo "false"; die;
}
}
public function updatePassword(Request $request){
if($request->isMethod('post')){
$data = $request->all();
$adminCount = Admin::where(['username' => Session::get('adminSession'),'password'=>md5($data['current_pwd'])])->count();
if ($adminCount == 1) {
$password = md5($data['new_pwd']);
Admin::where('username',Session::get('adminSession'))->update(['password'=>$password]);
return redirect('/admin/settings')->with('flash_message_success', 'Password updated successfully.');
}else{
return redirect('/admin/settings')->with('flash_message_error', 'Current Password entered is incorrect.');
}
}
}
blade file:
<form method="POST" action="{{ route('/admin/update-pwd') }}" enctype="multipart/form-data">
#csrf
#method('PATCH')
<strong class="text-muted d-block mb-2">Enter Current Password</strong>
<div class="input-group mb-3">
<div class="input-group input-group-seamless">
<input type="password" name="current_pwd" class="form-control #error('password') is-invalid #enderror" id="form2-password" placeholder="Password">
<span class="input-group-append">
<span class="input-group-text">
<i class="material-icons">lock</i>
</span>
</span>
</div>
</div>
<strong class="text-muted d-block mb-2">Enter New Password</strong>
<div class="input-group mb-3">
<div class="input-group input-group-seamless">
<input type="password" name="new_pwd" class="form-control #error('password') is-invalid #enderror" id="form2-password" placeholder="Password">
<span class="input-group-append">
<span class="input-group-text">
<i class="material-icons">lock</i>
</span>
</span>
</div>
</div>
<strong class="text-muted d-block mb-2">Confirm New Password</strong>
<div class="input-group mb-3">
<div class="input-group input-group-seamless">
<input type="password" name="confirm_pwd" class="form-control #error('password') is-invalid #enderror" id="form2-password" placeholder="Password">
<span class="input-group-append">
<span class="input-group-text">
<i class="material-icons">lock</i>
</span>
</span>
</div>
</div>
#error('password')
<div class="small text-danger">{{ $message }}</div>
#enderror
<button type="submit" class="mb-2 btn btn-primary mr-2">Update Password</button>
</form>
Routes:
Route::get('/admin/changepassword', 'ChangepasswordController#changepassword');
Route::get('/admin/check-pwd','AdminController#chkPassword');
Route::match(['get', 'post'],'/admin/update-pwd','AdminController#updatePassword');

Answer 1

When you use the route helper it expects that you provide a route name not a URI, so add this:
Route::match(['get', 'post'],'/admin/update-pwd','AdminController#updatePassword')
->name('admin.update_password');
Then in your view you can use:
route('admin.update_password');
Or use the url helper method instead:
// instead of this
{{ route('/admin/update-pwd') }}
//use
{{ url('/admin/update-pwd') }}

Answer 2

You are trying to use Laravel named route inside your form method. Use Laravel Named Routed, and define it inside your form.
//inside web.php
Route::post('/admin/update-pwd','AdminController#updatePassword')->name('admin/update-pwd');
Then you will be able to use inside form
<form method="POST" action="{{ route('/admin/update-pwd') }}" enctype="multipart/form-data">