Title: Error with TCPDF
Last modified: March 31, 2019

---

# Error with TCPDF

 *  [bassch](https://wordpress.org/support/users/bassch/)
 * (@bassch)
 * [7 years ago](https://wordpress.org/support/topic/error-with-tcpdf/)
 * Hi,
    I have a problem with TCPDF when I want to generate a certificate.
 * This is the error code :
 * Warning: Illegal string offset ‘url’ in /htdocs/wp-content/plugins/coursepress/
   2.0/include/tcpdf/tcpdf.php on line 18808
 * Warning: Illegal string offset ‘url’ in /htdocs/wp-content/plugins/coursepress/
   2.0/include/tcpdf/tcpdf.php on line 18808
    TCPDF ERROR: Some data has already
   been output, can’t send PDF file
 * It’s impossible for me to see the preview when I set up the basic certificate
   and the same when a student want to access to his certificate.
 * Can you help me please ?
 * Thanks in Advanced.

Viewing 1 replies (of 1 total)

 *  Plugin Support [Amin – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support2/)
 * (@wpmudev-support2)
 * [7 years ago](https://wordpress.org/support/topic/error-with-tcpdf/#post-11375883)
 * Hello bassch,
 * I’m sorry to hear about this issue with our plugin.
 * That can be a result of the conflict with another plugin. Can you run the plugin
   conflict test? You can follow the steps from the flowchart:
    [https://premium.wpmudev.org/wp-content/uploads/2015/09/Support-Process-Support-Process.gif](https://premium.wpmudev.org/wp-content/uploads/2015/09/Support-Process-Support-Process.gif)(
   make sure you have a backup before making any changes)
 * kind regards,
    Kasia

Viewing 1 replies (of 1 total)

The topic ‘Error with TCPDF’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/coursepress_f7e9b6.svg)
 * [CoursePress Learning Management System](https://wordpress.org/plugins/coursepress/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/coursepress/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/coursepress/)
 * [Active Topics](https://wordpress.org/support/plugin/coursepress/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/coursepress/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/coursepress/reviews/)

## Tags

 * [Certificate](https://wordpress.org/support/topic-tag/certificate/)

 * 1 reply
 * 2 participants
 * Last reply from: [Amin – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support2/)
 * Last activity: [7 years ago](https://wordpress.org/support/topic/error-with-tcpdf/#post-11375883)
 * Status: not resolved