Tutorial make rom from ruu windows 7

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I just read a another tutorial about this and if your new it's kinda long, maybe confusing. So hopefully this is better. Options are always better

You'll need only a couple things
7zip
the ruu of choice
unyaffs batch script (included)
autosign (check my signature)

Download the ruu of choice and begin to run it
press ctrl,alt,del and open taskmanager, select aruwizard.exe and go to file location.
Scroll through the file and find rom.zip move it to your desktop or other conveniant location.
Close the ruu then unzip the rom.zip with 7zip
unzip the unyaffs batch file
inside the rom.zip you'll find system.img and boot.img
move the system.img into the unyaffs folder and double click the unyaffs.bat
In the out file will be all the files from the system.img
Now take the boot.img and the files from the system.img and put them in the same folder
In that same folder make a meta-inf folder and put your update script in there
zip it all up and sign it

I get this error, when using the tool. What should I do?