PHP Fatal error: Call to undefined method APCu_Object_Cache::incr2()

  • Upgraded database and from version WC 3.0.3 to WC 3.0.8 and also updated several plug-ins. Use PayPal for payments and have both IPN and PDT set-up. Since upgrading, on some orders we see an IPN or a PDT in Order Notes but never see “Order status changed from Pending Payment to Processing”. This is happening randomly. When this occurs, the customer does not get a receipt email and we do not get a new order notification. Also since upgrading, cancelled orders once they reach their time limit never send an email but I see no difference in the order notes from prior to the upgrade and now after the upgrade. Both scenarios have a Unpaid order cancelled – time limit reached. Order status changed from Pending payment to Cancelled so I am perplexed on those.

    Installed PHP logging and for the orders that no emails are being sent out, we see
    PHP Fatal error: Call to undefined method APCu_Object_Cache::incr2() in /home/content/a2pewpnas01_data03/35/3702635/html/wp-content/object-cache.php on line 242

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