Build Problem

[BlackDevilDev]

Buildfile: C:\compiled\server_Freya_V.0.2\L2J_Server\build.xml
clean:
   [delete] Deleting directory C:\compiled\server_Freya_V.0.2\L2J_Server\build
verifyRequirements:
init:
    [mkdir] Created dir: C:\compiled\server_Freya_V.0.2\L2J_Server\build
    [mkdir] Created dir: C:\compiled\server_Freya_V.0.2\L2J_Server\build\classes
    [mkdir] Created dir: C:\compiled\server_Freya_V.0.2\L2J_Server\build\dist
    [mkdir] Created dir: C:\compiled\server_Freya_V.0.2\L2J_Server\build\dist\login
    [mkdir] Created dir: C:\compiled\server_Freya_V.0.2\L2J_Server\build\dist\gameserver
version:
compile:
    [javac] Compiling 1526 source files to C:\compiled\server_Freya_V.0.2\L2J_Server\build\classes
    [javac] javac: invalid target release: 1.7
    [javac] Usage: javac <options> <source files>
    [javac] use -help for a list of possible options

BUILD FAILED
C:\compiled\server_Freya_V.0.2\L2J_Server\build.xml:56: Compile failed; see the compiler error output for details.

Total time: 2 seconds