when I make new sending with Airmail template I received next error message:
Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Tag currentmonthname invalid in Entity, line: 84 in /home/wp-content/plugins/wpnewsman-newsletters/lib/emogrifier.php on line 177. Warning: Cannot modify header information - headers already sent by (output started at /home/wp-content/plugins/wpnewsman-newsletters/lib/emogrifier.php:177) in /home/wp-includes/pluggable.php on line 896.
What it can be? last time when I make sending (week ago) this template worked well.