PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback

  • This is the following error (currently warnings) that we are getting with the Zoho plugin. 

    [19-Mar-2020 09:26:09 UTC] PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, class 'ZohoCampaign' does not have a  method 'my_custom_checkout_field_update_order_meta' in  /wp-includes/class-wp-hook.php on line 290
[19-Mar-2020 09:39:12 UTC] PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, class 'ZohoCampaign' does not have a  method 'my_custom_checkout_field_update_order_meta' in  /wp-includes/class-wp-hook.php on line 290
[19-Mar-2020 09:43:42 UTC] PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, class 'ZohoCampaign' does not have a method 'my_custom_checkout_field_update_order_meta' in  /wp-includes/class-wp-hook.php on line 290

    The file ./plugins/zoho-campaigns/includes/class.zcwc.php seem to have code referenced by this, would be great you could take a into this and possibly apply a fix for us please?

    Zoho Campaigns plugin version 2.0.3
WooCommerce version 4.0.0
Wordpress version v5.3.2
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