i am getting this error when trying to build a flight plan with a follow in it.. Can someone give me a little help
/home/osam/paparazzi3/var/Unicorn2/sim/nav.o: In function `nav_periodic_task': nav.c:(.text+0x15c0): undefined reference to `get_ac_info'
collect2: ld returned 1 exit status Error while building custom runtime system make[1]: *** [/home/osam/paparazzi3/var/Unicorn2/sim/simsitl] Error 2 make[1]: Leaving directory `/home/osam/paparazzi3/sw/airborne'