Problem Provisioning a site

Hi,
I have been having some setup issues with the provisioning of a site on my WPMS network.

Placing an order set the order to pending rather than imediate setup, when in the whmcs admin are and accepting the order, it goes to a blank screen. The order remains pending, no site created.

Enabling display errors shows the following;
Fatal error: Call to undefined function logModuleCall() in /home/.../public_html/system/modules/servers/whmcs_multisite/whmcs_multisite.php on line 187

Have I missed a setup option or setting?

Thanks in advance.
Tyrone