Cart problem

[EIF]

I am updating from J3 and VM3 to J4 and VM4.0.12.

Normally I use the OPC extension from Rupostel. When hitting the place order button, I got the error: Call to undefined method Joomla\Database\Mysqli\MysqliDriver::query
I think something wrong in one of the extension files, so I have reported this to Rupostel.

But switching of the extension and using the default cart checkout from virtuemart, I get the following order after hitting the place order button: "Class "JDispatcher" not found ".

Anyone an idea what is wrong?

[jenkinhill]

Any other 3rd party plugins? Such as Advanced Shipping by Rules?

[EIF]

ah, thank you for pointing me in the right direction.

It was caused by the "Advanced Ordernumbers for VirtueMart" plugin from open-tools. Old extension I used, but it is not compatible and is no longer maintained