DOMDocument::loadHTML() errors triggered on cache rebuild

Every time I rebuild the caches a I get two error messages as detailed bellow. In case it's helpful, here's the HTML code that I pasted into the module config form:

<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
<link rel="manifest" href="/site.webmanifest">
<link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5">
<meta name="msapplication-TileColor" content="#da532c">
<meta name="theme-color" content="#ffffff”>

and here are the error messages:

    Warning: DOMDocument::loadHTML(): AttValue: " expected in Entity, line: 7 in _responsive_favicons_validate_tags() (line 119 of modules/contrib/responsive_favicons/responsive_favicons.module).

    _responsive_favicons_validate_tags('





    ') (Line: 92)
    responsive_favicons_load_all_icons() (Line: 36)
    responsive_favicons_page_attachments(Array) (Line: 297)
    Drupal\Core\Render\MainContent\HtmlRenderer->invokePageAttachmentHooks(Array) (Line: 273)
    Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117)
    Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
    Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
    call_user_func(Array, Object, 'kernel.view', Object) (Line: 111)
    Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156)
    Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
    Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
    Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
    Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
    Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
    Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
    Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
    Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
    Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 694)
    Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

    Warning: DOMDocument::loadHTML(): Couldn't find end of Start Tag meta in Entity, line: 7 in _responsive_favicons_validate_tags() (line 119 of modules/contrib/responsive_favicons/responsive_favicons.module).

    _responsive_favicons_validate_tags('





    ') (Line: 92)
    responsive_favicons_load_all_icons() (Line: 36)
    responsive_favicons_page_attachments(Array) (Line: 297)
    Drupal\Core\Render\MainContent\HtmlRenderer->invokePageAttachmentHooks(Array) (Line: 273)
    Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117)
    Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
    Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
    call_user_func(Array, Object, 'kernel.view', Object) (Line: 111)
    Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156)
    Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
    Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
    Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
    Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
    Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
    Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
    Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
    Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
    Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 694)
    Drupal\Core\DrupalKernel->handle(Object) (Line: 19)