If you are using CCAavenue WHMCS MCPG module (v1.1.1) you will have problem after upgrading your whmcs to version 6.0
your clients will see this error when they want to pay invoices.
Warning: include(../../dbconnect.php): failed to open stream: No such file or directory in/home/username/public_html/modules/gateways/ccavepay/ccavepayRequestHandler.php on line 11
To solve this problem you should change some details in some file.
Find the files from the directory below:
modules/gateways/ccavepay/ccavepayRequestHandler.php
modules/gateways/ccavepay/ccavepayCancel.php
modules/gateways/callback/ccavepay.php
and change this line of each file
include("../../../dbconnect.php");
to
include("../../../init.php");
and your problem will be solve.
Download the error fixed module by Clicking Here.