Sorry to be the bearer of bad news but Bryce 7 does not work with the newer OS for Mac. Even though you did not state you are running a mac I assume you are based on the particular error you described.
I do not run a mac but there are others who have gotten Bryce to work but it requires some clever tricks. Hopefully someone will chime in and explain it much better.
Best of luck. And again, sorry to be the bearer of bad news. It is written on the product page that Bryce 7 is not compatible with the newer OS versions but it seems very few people actually notice it.