public function lacks forward declaration (symbol "@yH_OnPlayerEnterDynamicCP@002")

included nex-ac in my script and got following errors:

../pawno/include/nexac.inc(5673) : warning 235: public function lacks forward declaration (symbol "@yH_OnPlayerEnterDynamicCP@002")
../pawno/include/nexac.inc(5757) : warning 235: public function lacks forward declaration (symbol "@yH_OnPlayerLeaveDynamicCP@002")
../pawno/include/nexac.inc(5922) : warning 235: public function lacks forward declaration (symbol "@yH_OnPlayerEnterDynRaceCP@002")
../pawno/include/nexac.inc(6008) : warning 235: public function lacks forward declaration (symbol "@yH_OnPlayerLeaveDynRaceCP@002")
../pawno/include/nexac.inc(6207) : warning 235: public function lacks forward declaration (symbol "@yH_OnPlayerSelectDynObj@002")