Warning: base64_decode() expects parameter 1 to be string, array given in /home/edtraining/public_html/wp-content/plugins/event-espresso-core-reg/core/EE_Session.core.php on line 972
Warning: preg_match() expects parameter 2 to be string, array given in /home/edtraining/public_html/wp-content/plugins/event-espresso-core-reg/core/EE_Session.core.php on line 974
Can you go to Event Espresso > General Settings > Admin Options then set Encode Session Data? to No?
It’s probably also a good idea to turn off error display/WP_DEBUG so your site doesn’t display PHP notices and warnings, unless of course if you’re developing code on that site right now.
You can also update to 4.9.20.p and that will ensure those Warnings are not triggered.
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Support forum for Event Espresso 3 and Event Espresso 4.