Im followed this tutorial -http://www.rune-server.org/runescape-development/rs2-server/tutorials/307510-pi-summoning-base.html
and im still getting errors:

src\server\model\players\packets\DropItem.java:30: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:42: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:55: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:66: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:76: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:87: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:98: followPlayer(int) in server.m
odel.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:110 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:120 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:132 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:142 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:153 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:164 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer()
;
^
src\server\model\players\packets\DropItem.java:176 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
src\server\model\players\packets\DropItem.java:187 : followPlayer(int) in server.
model.players.PlayerAssistant cannot be applied to ()
c.getPA().followPlayer();
^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
15 errors
Press any key to continue . . .
if anybody can help me fix plz post or ask for teamview