0 Call to undefined function cal_days_in_month()

Hello

I just boght the OS Services Booking and try to add one Item.

I add an employe too but in front end says No staff available!

when I go to employe where I think I need to click on calender and add the employe to the item I get an Error

An error has occurred.

0 Call to undefined function cal_days_in_month()

am I in right place to add staff to an Item?? Can you help me Please??


I try to find the error on your form page the result was:


Access Denied - Sucuri Website Firewall

If you are the site owner (or you manage this site), please whitelist your IP or if you think this block is an error please open a support ticket and make sure to include the block details (displayed in the box below), so we can assist you in troubleshooting the issue.
Block details:
Your IP: 86.27.157.166

URL: www.joomdonation.com/forum/search.html?q...&catids=88&start=760

Your Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0

Block ID: EVA083

Block reason: An attempt to evade and bypass security filters was detected.

Time: Wed Feb 21 13:33:10 2018

Server ID: 13011

Hi Kevin,
Your OS Services Booking version is too old, please upgrade it to latest version to get the issue solved.
Thanks
Dam

Bro Did you read what I said??? I just boght the OS Services Booking
how can you sell me an old Version in 4 days ago????
it also says in my dashbord the OS vesion is up to date. see my attach file.
I need this problem be resolved soon, so next time before you replay to my topic, Please read it.