Fatal error

  • I recently installed the theme Twenty Seventeen and I get the following error.

    Fatal error: Uncaught ValueError: Unknown format specifier “y” in C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\theme.php:1497 Stack trace: #0 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\theme.php(1497): vsprintf(‘https://localhos…’, Array) #1 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\theme.php(1215): get_custom_header() #2 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\theme.php(1735): get_header_image_tag() #3 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\theme.php(1747): get_custom_header_markup() #4 C:\xampp\htdocs\Enfermedad de Lyme\wp-content\themes\twentyseventeen\template-parts\header\header-image.php(15): the_custom_header_markup() #5 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\template.php(785): require(‘C:\\xampp\\htdocs…’) #6 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\template.php(718): load_template(‘C:\\xampp\\htdocs…’, false, Array) #7 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\general-template.php(204): locate_template(Array, true, false, Array) #8 C:\xampp\htdocs\Enfermedad de Lyme\wp-content\themes\twentyseventeen\header.php(37): get_template_part(‘template-parts/…’, ‘image’) #9 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\template.php(783): require_once(‘C:\\xampp\\htdocs…’) #10 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\template.php(718): load_template(‘C:\\xampp\\htdocs…’, true, Array) #11 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\general-template.php(48): locate_template(Array, true, true, Array) #12 C:\xampp\htdocs\Enfermedad de Lyme\wp-content\themes\twentyseventeen\index.php(18): get_header() #13 C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\template-loader.php(106): include(‘C:\\xampp\\htdocs…’) #14 C:\xampp\htdocs\Enfermedad de Lyme\wp-blog-header.php(19): require_once(‘C:\\xampp\\htdocs…’) #15 C:\xampp\htdocs\Enfermedad de Lyme\index.php(17): require(‘C:\\xampp\\htdocs…’) #16 {main} thrown in?C:\xampp\htdocs\Enfermedad de Lyme\wp-includes\theme.php?on line?1497

    Does anybody know how I can fix it

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  • Hi @phoenixzagor I am not able to replicate this on my test site with the theme and only Gutenberg plugin. Which theme were you using before installing this one?

    There might be a conflict on your site, please attempt to disable all plugins, if the problem goes away, enable them one by one to identify the source of your troubles.
    If you are worried about how your site will look when you deactivate the plugins, you can use the Health Check plugin to troubleshoot your site?Health Check

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