Hi,
Finally I found a JomSocial package to try this out.
After I installed JomSocial 2.8.3, I couldn't create any new item in CMGroupBuying because of this error:
An error has occurred.
500 View not found [name, type, prefix]: cmgroupbuying, html, cmgroupbuyingView
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This problem is caused by "Jomsocial Update" plugin of JomSocial.
To fix this, simply you disable this plugin. If you still need to use this plugin, you can open plugins/system/jomsocialupdate/jomsocialupdate.php, navigate to line 57:
$task = JRequest::getCmd( 'task' , '' );
and change it to
$task = JRequest::getVar( 'task' , '' );
With this change both JomSocial and CMGroupBuying still work well and the problem is solved.
Regards,
Hung