I always get this error when adding certain things. Is it because i don't have something imported or do I need something else?

Code:
src\server\model\players\Player.java:311: error: appearanceUpdateRequired has pr
ivate access in Player
                                        c.appearanceUpdateRequired = true;
                                         ^
src\server\model\players\Player.java:318: error: appearanceUpdateRequired has pr
ivate access in Player
                                        c.appearanceUpdateRequired = true;
                                         ^
src\server\model\players\Player.java:325: error: appearanceUpdateRequired has pr
ivate access in Player
                                        c.appearanceUpdateRequired = true;
                                         ^
src\server\model\players\Player.java:332: error: appearanceUpdateRequired has pr
ivate access in Player
                                        c.appearanceUpdateRequired = true;
                                         ^
Note: src\server\model\players\Client.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors
Press any key to continue . . .