Error on activation
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I run a multisite installation. Once I activated the plugin in one of the sites and clicked on Email Subscriber, I got this error:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'es_admin_option' not found or invalid function name in /home/muthuft/public_html/wp-includes/plugin.php on line 525I have no clue what this means. Does it normally work for other multisites? Because I tried on a single site and it works, but on my main site it doesn’t. Are there any known popular plugin conflicts?
Thanks in advance for helping me with this 🙂
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