need help fixing this error:


[SPOIL]src\server\model\npcs\NPCHandler.java:1371: error: cannot find symbol
newNPC.summonedBy = c.playerId;
^
symbol: variable summonedBy
location: variable newNPC of type NPC
src\server\model\npcs\NPCHandler.java:1425: error: cannot find symbol
Client slaveOwner = (Server.playerHandler.players[npcs[i
].summonedBy] != null ? (Client) Server.playerHandler.players[npcs[i].summonedBy
] : null);

^
symbol: variable summonedBy
location: class NPC
src\server\model\npcs\NPCHandler.java:1425: error: cannot find symbol
Client slaveOwner = (Server.playerHandler.players[npcs[i
].summonedBy] != null ? (Client) Server.playerHandler.players[npcs[i].summonedBy
] : null);

^
symbol: variable summonedBy
location: class NPC
src\server\model\npcs\PetHandler.java:81: error: method followPlayer in class Pl
ayerAssistant cannot be applied to given types;
c.getPA().followPlayer(c.playerIndex);
^
required: no arguments
found: int
reason: actual and formal argument lists differ in length
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors
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[/SPOIL]