Hello,
Thank you for your reply. We have the WooCommerce PDF Invoices & Packing Slips version 2.1.4. This shows as the latest version here: https://www.ads-software.com/plugins/woocommerce-pdf-invoices-packing-slips/ so we were unaware there was a newer version. How do we get the latest version? Also, the version of “WooCommerce Print Orders” by: https://www.simbahosting.co.uk/s3/product/woocommerce-automatic-order-printing/ is “Version 2.5.1”. Everything worked up until we updated WordPress to the latest 4.9.2 and WooCommerce to 3.3.0.
The last three errors we got were:
2018-01-30T12:12:28+00:00 CRITICAL Call to a member function get_pdf() on null
2018-01-30T12:14:55+00:00 CRITICAL Call to a member function get_pdf() on null
2018-01-30T12:42:50+00:00 CRITICAL Call to a member function get_pdf() on null
we then deactivated the WooCommerce PDF Invoices & Packing Slips plugin and the “Internal Error” message is gone and all orders are being processed as expected without issue.
Thank you!