afcad 2.2.1

Goodnight folks, im a brazilian guy so sorry for my english.
I've afcad 221 and it is not oppening cause when it starts and begining compiling the airports it gets error signature "unknown" and a message appears saying it need to be closed.
Do you know something about this??? Could you help me???
Thx
Lugon
I've afcad 221 and it is not oppening cause when it starts and begining compiling the airports it gets error signature "unknown" and a message appears saying it need to be closed.
Do you know something about this??? Could you help me???
Thx
Lugon