Title: MpdfException: Invalid input characters
Last modified: January 31, 2019

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# MpdfException: Invalid input characters

 *  Resolved [peter lipp](https://wordpress.org/support/users/peter-lipp/)
 * (@peter-lipp)
 * [7 years, 4 months ago](https://wordpress.org/support/topic/mpdfexception-invalid-input-characters/)
 * Just got this error when trying to produce a PDF. In detail:
 * Fatal error: Uncaught Mpdf\MpdfException: Invalid input characters. Did you set
   $mpdf->in_charset properly? in /home/.sites/856/site3670/web/pbc-wp/wp-content/
   plugins/pdf-print/vendor/mpdf/mpdf/src/Mpdf.php:28352
 * Stack trace:
    #0 /home/.sites/856/site3670/web/pbc-wp/wp-content/plugins/pdf-
   print/vendor/mpdf/mpdf/src/Mpdf.php(14828): Mpdf\Mpdf->purify_utf8(‘\r\n\t\t\
   tWriteHTML(‘\r\n\t\t\tapply_filters(”, Array) #4 /home/.sites/856/site3670/web/
   pbc-wp/wp-includes/plugin.php(515): WP_Hook->do_action(Array) #5 /home/.sites/
   856/site3670/web/pbc-wp/wp-includes/class-wp.php(728): do_action_ref_array(‘wp’,
   Array) #6 /home/.sites/856/site3670/web/pbc-wp/wp-includes/functions.php(964):
   WP->main(”) #7 /home/.sit in /home/.sites/856/site3670/web/pbc-wp/wp-content/
   plugins/pdf-print/vendor/mpdf/mpdf/src/Mpdf.php on line 28352

Viewing 1 replies (of 1 total)

 *  Plugin Author [bestwebsoft](https://wordpress.org/support/users/bestwebsoft/)
 * (@bestwebsoft)
 * [7 years, 1 month ago](https://wordpress.org/support/topic/mpdfexception-invalid-input-characters/#post-11466781)
 * Hi,
 * Thank you for contacting us!
 * Could you please specify which PHP version is installed on your server?
 * It seems like you are using 7.x.x PHP version on your site, if so – please follow
   the next instructions in order to upgrade MPDF library for PDF & Print plugin:
   
   1) Go to PDF & Print settings page; 2) Open the “Misc” tab; 3) Click the “Upgrade”
   button; 4) Test the PDF doc creation and let us know about the result.

Viewing 1 replies (of 1 total)

The topic ‘MpdfException: Invalid input characters’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [bestwebsoft](https://wordpress.org/support/users/bestwebsoft/)
 * Last activity: [7 years, 1 month ago](https://wordpress.org/support/topic/mpdfexception-invalid-input-characters/#post-11466781)
 * Status: resolved