KnpPaginatorBundle: An exception has been thrown during the rendering of a template ("Notice: Array to string conversion").

i am having an issue with the template rendering, and I am pulling my hair out over it. Please could you help.

When I add pagination I get the error:

An exception has been thrown during the rendering of a template (“Notice: Array to string conversion”).

The offending template is:

vendor/knplabs/knp-paginator-bundle/templates/Pagination/twitter_bootstrap_v4_pagination.html.twig

However I have tried other templates.

My controller:

$currentTenant = $tenantContext->getCurrentTenant();
$em = $this->getDoctrine()->getManager();
$qualificationLevelRepository = $em->getRepository(QualificationLevel::class);

$qualificationLevelsQuery = $qualificationLevelRepository->createQueryBuilder('q')
    ->andWhere('q.tenant = :val')
    ->setParameter('val', $currentTenant)
    ->orderBy('q.id', 'ASC')
    ->getQuery();

$qualificationLevels = $paginator->paginate(
    // Doctrine Query, not results
    $qualificationLevelsQuery,
    // Define the page parameter
    $request->query->getInt('page', 1),
    // Items per page
    5
);
    
return $this->render('administration/qualification_level/manage-qualification-levels.html.twig', [
    'controller_name' => 'QualificationLevelController',
    'tenant' => $currentTenant,
    'qualificationLevels' => $qualificationLevels
]);

My Page:

<table class="table table-hover">
    ... 
    <tbody>
          {%  if qualificationLevels|length == 0 %}
            <tr>
                  <td colspan="9">{{ 'There are no campuses set up yet.'|trans }}</td> 
             </tr>
        {% endif %}
        {% for qualificationLevel in qualificationLevels  %}  
        <tr data-href="#" data-id="{{ qualificationLevel.id }}" class="load-cqualificationLevel-edit-popup">
              <th scope="row">{{ qualificationLevel.id }}</th>
              <td>{{ qualificationLevel.name }}</td>
              <td>{{ qualificationLevel.description }}</td>
        </tr>
        {% endfor %}
      </tbody>
</table>

<div class="navigation">
    {{ knp_pagination_render(qualificationLevels) }}
</div>

My YAML:

knp_paginator:
    page_range: 5                       # number of links showed in the pagination menu (e.g: you have 10 pages, a page_range of 3, on the 5th page you'll see links to page 4, 5, 6)
    default_options:
        page_name: page                 # page query parameter name
        sort_field_name: sort           # sort field query parameter name
        sort_direction_name: direction  # sort direction query parameter name
        distinct: true                  # ensure distinct results, useful when ORM queries are using GROUP BY statements
        filter_field_name: filterField  # filter field query parameter name
        filter_value_name: filterValue  # filter value query parameter name
    template:
        pagination: '@KnpPaginator/Pagination/twitter_bootstrap_v4_pagination.html.twig'
        #pagination: '@KnpPaginator/Pagination/sliding.html.twig'     # sliding pagination controls template
        #sortable: '@KnpPaginator/Pagination/sortable_link.html.twig' # sort link template
        #filtration: '@KnpPaginator/Pagination/filtration.html.twig'  # filters template

It was installed with the following command: composer require knplabs/knp-paginator-bundle

Please can you help.