[Qemu-ppc] Help with trying to install Mac OS 9.2.2 on QEMU on Linux Ubuntu 16.04.4 boot error "No valid state has been set by load or init-program"

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Hello all, 
I found your list after doing somewhat exhaustive searches for hours online trying to find a solution to my problem. Apologies if my online manners are not correct here.

I have Linux Ubuntu 16.04.4 and I did an install of Qemu from the Ubuntu repository doing a “sudo apt-get install qemu” 
I also installed open bios using “apt-get install openbios-ppc”

I am trying to install Mac OS 9.2.2 emulation for ppc. I downloaded the OS 9.2.2 image file and I am trying to run the .iso using the commands:

qemu-system-ppc -boot d -M mac99 -m 512 -prom-env 'auto-boot?=true' -prom-env 'boot-args=-v' -prom-env 'vga-ndrv?=true' -drive file=MacOS9.2.2.iso,format=raw,media=cdrom -drive file=MacOS9.2.2.img,format=raw,media=disk -device usb-mouse -device usb-kbd

However I am getting error “No valid state has been set by load or init-program”

Image file of error screenshot:  https://i.imgur.com/SKxprVd.png

I am trying to get this running for my class project. 

Any help greatly appreciated! 
Thank you