ive added em client side, just been following one of the tuts.. and got these errors

Code:
src\server\model\players\Client.java:304: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                                getCombat().applyNpcMeleeDamage(npcIndex, 1, pre
viousDamage / 2);
                                                                             ^
src\server\model\players\Client.java:307: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                                getCombat().applyPlayerMeleeDamage(playerIndex,
1, previousDamage / 2);

   ^
src\server\model\players\Client.java:309: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                        damage4 = previousDamage % 2;
                                  ^
src\server\model\players\Client.java:311: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                                previousDamage = previousDamage + 1;
                                ^
src\server\model\players\Client.java:311: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                                previousDamage = previousDamage + 1;
                                                 ^
src\server\model\players\Client.java:315: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                                getCombat().applyNpcMeleeDamage(npcIndex, 2, pre
viousDamage);
                                                                             ^
src\server\model\players\Client.java:318: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                                getCombat().applyPlayerMeleeDamage(playerIndex,
2, previousDamage);

   ^
src\server\model\players\Client.java:322: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                        previousDamage = 0;
                        ^
src\server\model\players\CombatAssistant.java:290: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                    applyNpcMeleeDamage(i, 2, c.previousDamage / 2);
                                               ^
src\server\model\players\CombatAssistant.java:998: cannot find symbol
symbol  : variable previousDamage
location: class server.model.players.Client
                        applyPlayerMeleeDamage(i, 2, c.previousDamage / 2);
                                                      ^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
10 errors
Press any key to continue . . .
EDIT : FIXED BY ADDING THESE

public boolean usingClaws = false;
public int previousDamage = 0;