Welcome to the forums.
You haven't really provided any information, and you aren't likely to get a helpful response, I fear.
Please refer to the Forum Rules, conveniently linked at the top of every page in red, for information to help you compose a better problem statement, which needs to include detailed information about your hardware and the version of FreeNAS in question.
Hardware without AES-NI is generally likely to be inappropriate for FreeNAS, typically a consumer PC of some sort, which usually also has a selection of inappropriate devices such as ethernets and other fun stuff.