My Supervisor is not an expert
You face a few options. Suppose that you insist that you must do your PhD in AI.


You should do whatever it takes to find a new advisor or an appropriate co-advisor. This includes talking to other faculty, the department chair, and even the dean of the college and graduate school. When "whatever it takes" fails to be a suitable choice, you must take a different approach.


Suppose that you decide or determine that doing a PhD in AI is not as important as doing a PhD at the university where you currently reside.


You should do whatever it takes to find an advisor + project that is of suitable interest to you for your work. This especially includes talking to other faculty as well as reading in other research areas. When "whatever it takes" fails to be a suitable choice, you must take a different approach.


Alternatively, suppose that you decide or determine that you will do the PhD in AI with only administrative support and no research support from a faculty advisor.


You should do whatever it takes to complete the appropriate research on your own. This includes reading journals and other dissertations in the field and communicating directly with other researchers in the field. This can/should include bringing faculty on to your committee who have the appropriate background in your chosen topic.


Suppose that you decide or determine that you must do your PhD in a certain topic (AI or something else) but for whatever reason cannot do it where you currently are.


You should do whatever it takes to find a new university + advisor + project that is of suitable interest to you. This includes researching where your topic is currently being done at other universities and contacting the faculty at that university directly to ask whether they have a potential opening for you to join the group. When "whatever it takes" fails to be a suitable choice, you must take a different approach.


At this point, you may likely realize that you will not be doing a PhD.