Symfony\Component\Routing\Exception\RouteNotFoundException: Route "/test" does not exist. in Drupal\Core\Routing\RouteProvider->getRouteByName()

Problem/Motivation

Steps to reproduce

1. Installed the module using composer command composer require 'drupal/webform_autocomplete_select2:^1.0'

2. Enable the module.

3.Go to webform and add element webform_autocomplete_select2 .
Add a not valid route /test.

4. Go to the webform view page.

The route does not exist, and error is produced.

Proposed resolution

Check if route exist or not and provide validations errors if route does not exist.

Remaining tasks

User interface changes

API changes

Data model changes