Title: Plugin conflict
Last modified: June 3, 2025

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# Plugin conflict

 *  Resolved [carluy](https://wordpress.org/support/users/carluy/)
 * (@carluy)
 * [12 months ago](https://wordpress.org/support/topic/plugin-conflict-448/)
 * Hi, I just found out that the Challan and Forminator PDF Generator Add-on plugins
   are having a conflict, both of them cant generate a PDF file and returns a error**“
   Cannot write to an undeclared property Mpdf\Mpdf::$cacheCleanupInterval”**.
 * Both plugins are already on its latest versions.
 * I need both of this plugin on the website I’m working on and I’m wordering if
   there a way to fix or a workaround for this issue.

Viewing 1 replies (of 1 total)

 *  Plugin Support [Ahmed Imran](https://wordpress.org/support/users/ahmedimran/)
 * (@ahmedimran)
 * [12 months ago](https://wordpress.org/support/topic/plugin-conflict-448/#post-18496629)
 * Hi [@carluy](https://wordpress.org/support/users/carluy/),
 * This issue happens because both Challan and the Forminator PDF Generator Add-
   on use different versions of the MPDF library, which leads to a conflict.
 * Unfortunately, we’re unable to ensure compatibility with the Forminator PDF Generator
   Add-on as it’s a premium plugin and we don’t have access to its codebase.
 * We’re looking into isolating the MPDF library in a future update of Challan to
   help prevent such conflicts.

Viewing 1 replies (of 1 total)

The topic ‘Plugin conflict’ is closed to new replies.

 * ![](https://ps.w.org/webappick-pdf-invoice-for-woocommerce/assets/icon-256x256.
   png?rev=2512818)
 * [PDF Invoices & Packing Slips for WooCommerce – Challan](https://wordpress.org/plugins/webappick-pdf-invoice-for-woocommerce/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/webappick-pdf-invoice-for-woocommerce/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/webappick-pdf-invoice-for-woocommerce/)
 * [Active Topics](https://wordpress.org/support/plugin/webappick-pdf-invoice-for-woocommerce/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/webappick-pdf-invoice-for-woocommerce/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/webappick-pdf-invoice-for-woocommerce/reviews/)

## Tags

 * [plugin conflict](https://wordpress.org/support/topic-tag/plugin-conflict/)

 * 1 reply
 * 2 participants
 * Last reply from: [Ahmed Imran](https://wordpress.org/support/users/ahmedimran/)
 * Last activity: [12 months ago](https://wordpress.org/support/topic/plugin-conflict-448/#post-18496629)
 * Status: resolved