The following error message is displayed when someone tries to post a new job on our job board, Version 1.8.

Notice: Undefined property: twitter::$curlResc in /home/OurDomain/public_html/jobboard/_includes/class.Twitter.php on line 46

Warning: curl_error(): supplied argument is not a valid cURL handle resource in /home/OurDomain/public_html/jobboard/_includes/class.Twitter.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /home/OurDomain/public_html/jobboard/_includes/class.Twitter.php:46) in /home/OurDomain/public_html/jobboard/_includes/function.redirect_to.php on line 30

Can anyone tell me what may be causing this problem and if so, how to fix it?