Problem with setting up appointment schedule

I have problem with setting up appointment schedule. When I try to press “Click here to start setting up your appointment schedule.” I get some error like

$weekday_Close){$errorMessage="weekday_Open"; ${'error_'.$weekday."_Open"}='y';} if($weekday_Close<$weekday_Open){$errorMessage="weekday_Close"; ${'error_'.$weekday."_Close"}='y';} }else{ if($weekday_Open>$weekday_Break || $weekday_Open>$weekday_Return || $weekday_Open>$weekday_Close){$errorMessage="weekday_Open"; ${'error_'.$weekday."_Open"}='y';} if($weekday_Break>$weekda
but lot of this. Did I mist something?
also I can not activate appointments on any day.

https://www.ads-software.com/plugins/skedmaker-online-scheduling/