I'm a civicrm user, and I have problrm with contribution page after upgrade to 4.7.29, My civicrm installed on Joomla 3.8.3, this error show when I open the contribution form from frontsite.
the error message is : Warning: require_once(CRM/Core/.php): failed to open stream: No such file or directory in /home/ablecomm/public_html/administrator/components/com_civicrm/civicrm/Civi/Payment/System.php on line 59
I have been trying to fix this but no have idea where is the problem.
is Anybody can help me? thankyou