The 2 OCRA's caught me out the first time I used it, so I remember to use OCRA not OCR A Extended, but I'm sure I loaded DroidSans, yet when I tried both, neither worked.
The error part is in Chapter5.5, but it was when I loaded my made-from-scratch PCB drawing into a generic CORE IC with 16 pins, it would put up an error that the copper layers weren't inside each other. I just switch to another 16 pin IC and it's fine.
I remember getting the error once before with a part that I modified one view in. All I did was mod another copy of the same svg and it didn't error on the load.