Secret Experience - [Java] Build Faile Error

[javac] C:\Projeto\*********\*********_CORE\java\com\it\br \gameserver\datatables\ArmorSetsTable.java:48: cannot find symbol
[javac] symbol : variable _instance
[javac] location: class com.it.br.gameserver.datatables.ArmorSetsTable
[javac] if(_instance == null)
[javac] ^
[javac] C:\Projeto\*********\*********_CORE\java\com\it\br \gameserver\datatables\ArmorSetsTable.java:49: cannot find symbol
[javac] symbol : variable _instance
[javac] location: class com.it.br.gameserver.datatables.ArmorSetsTable
[javac] _instance = new ArmorSetsTable();
[javac] ^
[javac] C:\Projeto\*********\*********_CORE\java\com\it\br \gameserver\datatables\ArmorSetsTable.java:50: cannot find symbol
[javac] symbol : variable _instance
[javac] location: class com.it.br.gameserver.datatables.ArmorSetsTable
[javac] return _instance;
[javac] ^
[javac] Note: C:\Projeto\*********\*********_CORE\java\com\it\br \gameserver\GeoEngine.java uses or overrides a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] 3 errors

BUILD FAILED
C:\Projeto\*********\*********_CORE\build.xml:66: Compile failed; see the compiler error output for details.

Total time: 11 seconds

ta diseno que ta dando erro nos simbolos mais os simbolos estão sertos nao entendi