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Fatal error: Uncaught Mpdf\MpdfException: Data has already been sent to output (/data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Mpdf.php at line 15975), unable to output PDF file in /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Mpdf.php:9512 Stack trace: #0 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-content/plugins/dk-pdf/includes/dkpdf-functions.php(212): Mpdf\Mpdf->Output('Alergick\xC3\xA9 ko\xC5\xBE...', 'I') #1 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-includes/class-wp-hook.php(324): dkpdf_output_pdf(Object(WP)) #2 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #3 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #4 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-includes/class-wp.php(830): do_action_ref_array('wp', Array) #5 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-includes/functions.php(1336): WP->main('') #6 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-blog-header.php(16): wp() #7 /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/index.php(17): require('/data/web/virtu...') #8 {main} thrown in /data/web/virtuals/45302/virtual/www/domains/studijni-svet.cz/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Mpdf.php on line 9512