Fatal error: Uncaught TypeError: strtolower(): Argument #1 ($string) must be of type string, array given in /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php:517
Stack trace:
#0 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php(517): strtolower(Array)
#1 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php(256): AMP_Tag_And_Attribute_Sanitizer->check_attr_spec_rule_value_casei(Object(DOMElement), 'subscriptions-s...', Array)
#2 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php(127): AMP_Tag_And_Attribute_Sanitizer->validate_attr_spec_list_for_node(Object(DOMElement), Array)
#3 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php(62): AMP_Tag_And_Attribute_Sanitizer->process_node(Object(DOMElement))
#4 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/class-amp-content.php(125): AMP_Tag_And_Attribute_Sanitizer->sanitize()
#5 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/class-amp-content.php(97): Penci_AMP_Content_Sanitizer::sanitize('\t\t<div data-ele...', Array, Array)
#6 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/class-amp-content.php(58): Penci_AMP_Content->sanitize('\t\t<div data-ele...')
#7 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/class-amp-content.php(23): Penci_AMP_Content->transform()
#8 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/class-amp-post-template.php(285): Penci_AMP_Content->__construct('<ul>\t\t\t\t\t\t\t\t\t\t\t...', Array, Array, Array)
#9 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/class-amp-post-template.php(104): Penci_AMP_Post_Template->build_post_content()
#10 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/penci-soledad-amp.php(376): Penci_AMP_Post_Template->__construct(4485)
#11 /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/penci-soledad-amp.php(303): penci_amp_render_post(4485)
#12 /customers/e/f/8/skriveguiden.com/httpd.www/wp-includes/class-wp-hook.php(324): penci_amp_render('')
#13 /customers/e/f/8/skriveguiden.com/httpd.www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#14 /customers/e/f/8/skriveguiden.com/httpd.www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#15 /customers/e/f/8/skriveguiden.com/httpd.www/wp-includes/template-loader.php(13): do_action('template_redire...')
#16 /customers/e/f/8/skriveguiden.com/httpd.www/wp-blog-header.php(19): require_once('/customers/e/f/...')
#17 /customers/e/f/8/skriveguiden.com/httpd.www/index.php(17): require('/customers/e/f/...')
#18 {main}
  thrown in /customers/e/f/8/skriveguiden.com/httpd.www/wp-content/plugins/penci-soledad-amp/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php on line 517