call_user_func_array() expects parameter 1 to be a valid callback
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I’ve just installed the plugin on a brand new WordPress install to see if it meets my needs, I’m getting the following error after activating:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘Worldpay_Payments’ not found in /mypath/www.sandbox.dev/wp-includes/plugin.php on line 525
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