Title: Plugin cannot be activated
Last modified: August 22, 2016

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# Plugin cannot be activated

 *  Resolved [Lalit Dubey](https://wordpress.org/support/users/lalit-dubey/)
 * (@lalit-dubey)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/)
 * Hello
    This plugin is very good but I need help. When I’m upload this plugin 
   using FTP then try to login with my admin id for activate this it show this error:-**
   Fatal error: Call to undefined method WooCommerce_PDF_Invoices::install() in /
   home/aXXXXXXX/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-
   slips/woocommerce-pdf-invoices-packingslips.php on line 145 .** How Can i Solve
   This.
 * [https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Thread Starter [Lalit Dubey](https://wordpress.org/support/users/lalit-dubey/)
 * (@lalit-dubey)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/#post-5612210)
 * Server Information
 * **Apache ver. 2.2.19
    PHP version 5.2.\* MySQL ver. 5.1
 *  Plugin Contributor [Ewout](https://wordpress.org/support/users/pomegranate/)
 * (@pomegranate)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/#post-5612433)
 * Hello Lalit,
    Have you tried installing the plugin via the wordpress.org repository(
   Plugins > Add New, then search for “WooCommerce PDF Invoices & Packing Slips”),
   or otherwise by uploading the zip via the WordPress interface? This sounds like
   somehow the upload was incomplete… Especially since that install method actually
   exists (line 159), and everything works as it should on my own test install.
 * The plugin should definitely be compatible with your server.
 * Let me know if it works when you install the plugin via the WordPress interface!
 * Ewout
 *  Thread Starter [Lalit Dubey](https://wordpress.org/support/users/lalit-dubey/)
 * (@lalit-dubey)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/#post-5612435)
 * Okkk
    thank’s for reply. I will try and inform you.
 *  Plugin Contributor [Ewout](https://wordpress.org/support/users/pomegranate/)
 * (@pomegranate)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/#post-5612444)
 * Hello Lalit,
    If you installed this plugin before installing WooCommerce, then
   1.5.2 will fix this issue. I got [another report](https://wordpress.org/support/topic/fatal-error-on-activation-if-woocommerce-not-installed?replies=4)
   about this error and it looks like the problem was actually in WooCommerce not
   being installed.
 * Let me know if this is indeed the case. If possible (not sure if you already 
   installed WC meanwhile), try installing the new version before installing WooCommerce,
   so that we can be sure it was this!
 * Ewout
 *  Thread Starter [Lalit Dubey](https://wordpress.org/support/users/lalit-dubey/)
 * (@lalit-dubey)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/#post-5612456)
 * Dear Ewout,
 * after update the error solve.
 * thank for the support.

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Plugin cannot be activated’ is closed to new replies.

 * ![](https://ps.w.org/woocommerce-pdf-invoices-packing-slips/assets/icon-256x256.
   png?rev=2189942)
 * [PDF Invoices & Packing Slips for WooCommerce](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/)
 * [Active Topics](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/reviews/)

 * 5 replies
 * 2 participants
 * Last reply from: [Lalit Dubey](https://wordpress.org/support/users/lalit-dubey/)
 * Last activity: [11 years, 4 months ago](https://wordpress.org/support/topic/plugin-cannot-be-activated-4/#post-5612456)
 * Status: resolved