Hi, I am having trouble with this plugin.   When appointments are booked I get a Slot is Taken message. IN the log i have a number of issues, AH01071: Got error 'PHP message: PHP Warning: Attempt to read property "duration" on null in httpdocs/wp-content/plugins/easy-appointments/src/logic.php on line 163PHP message: PHP Warning: Attempt to read property "duration" on null in /httpdocs/wp-content/plugins/easy-appointments/src/logic.php on line 166PHP message: PHP Warning: Attempt to read property "block_before" on null inhttpdocs/wp-content/plugins/easy-appointments/src/logic.php on line 169PHP message: PHP Warning: Attempt to read property "block_after" on null in/wp-content/plugins/easy-appointments/src/logic.php on line 169PHP message: PHP Warning: Attempt to read property "daily_limit" on null inhttpdocs/wp-content/plugins/easy-appointments/src/logic.php on line 303PHP message: PHP Warning: Attempt to read property "duration" on null