[confirmed - duplicate] After upgrade to 6 error on invoice duplicate

[SergeyM]

Hello,

 

I upgraded my old installation to the 6 version.

and now I got error on Invoice duplicate.

 

Fatal error: Class 'WHMCS\App' not found in /home/admin/domains/****/public_html/clients/includes/classes/WHMCS/Invoices.php on line 0

[WHMCS Nate]

Hello,

 

Thanks for this report. We have already gotten reports of this issue and CORE-8648 was opened to track it. I expect this case will be fixed in WHMCS 6.0.1.

 

Have a great day,

 

Nate C