Deprecated Method used

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Line image_with_title.module
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52 Call to deprecated method checkPlain() of class
Drupal\Component\Utility\SafeMarkup:
Will be removed before Drupal 9.0.0. Rely on Twig's
auto-escaping feature, or use the @link theme_render #plain_text
@endlink
key when constructing a render array that contains plain text in order
to
use the renderer's auto-escaping feature. If neither of these are
possible, \Drupal\Component\Utility\Html::escape() can be used in
places
where explicit escaping is needed.
52 Call to method checkPlain() of deprecated class
Drupal\Component\Utility\SafeMarkup:
Will be removed before Drupal 9.0.0. Use the appropriate
83 Call to deprecated method strlen() of class
Drupal\Component\Utility\Unicode:
in Drupal 8.6.0, will be removed before Drupal 9.0.0. Use
mb_strlen() instead.
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[ERROR] Found 3 errors