The error is related to use of unaligned memory address, but it should not be the case, being related to a pointer that is allocated.
That happens in the fixup for `append_hf_value()`. I suggest that you use default `kamailio.cfg` by adding also this function in the request_route() and then see if starts ok.
If yes, then it is a problem with your config, are you using modules that are not in stock kamailio repo?