The VIA2 chip on your Mac is bad. The error indicates a hardware problem.
Details
The main circuit board of your Mac contains a chip called the VIA2 which stands for Versatile Interface Adapter 2. This chip was originally made by Synertek. It controls the Nubus in your system.
What to do
The chip is bad. You may be able to get it replaced but more likely you will have to replace the entire main circuit board of your computer.