Hello, I have the same problem. After I updated WooCommerce, there was after click on order button ‘Internal Server Error’. Error is in WooCommerce PDF Invoices plugin because when I deactivated this plugin, it worked correctly.
I enabled WP_DEBUG, error is here:
SyntaxError:
Unexpected token < in JSON at position 0.
And when I create PDF invoice from administration – after click on orders, there was a fatal error in plugin:
Warning: require_once(header.php): failed to open stream: No such file or directory in /wp-content/plugins/woocommerce-pdf-invoices/includes/abstracts/abstract-bewpi-invoice.php on line 456
Fatal error: require_once(): Failed opening required 'header.php' (include_path='.:/usr/php56/lib/php') in /wp-content/plugins/woocommerce-pdf-invoices/includes/abstracts/abstract-bewpi-invoice.php on line 456
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This reply was modified 7 years, 10 months ago by stephanius.
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This reply was modified 7 years, 10 months ago by stephanius.