deploying WCK

I use Slide 2.1 and Jdk 1.4.2_12, I tried to deploy Slide with WCK but 
it get me this problem : 
   [copy] Copying 24 files to D:\Slide2.1\dist\slide\lib
build-core:
     [echo] Building WCK core
    [javac] Compiling 15 source files to 
D:\MyWorkSpace_2\WCK\wck\build\classes
    [javac] javac: source release 1.4 requires target release 1.4
    [javac] Usage: javac <options> <source files>
    [javac] where possible options include:
    [javac]   -g                        Generate all debugging info
    [javac]   -g:none                   Generate no debugging info
    [javac]   -g:{lines,vars,source}    Generate only some debugging info
    [javac]   -nowarn                   Generate no warnings
    [javac]   -verbose                  Output messages about what the 
compiler is doing
    [javac]   -deprecation              Output source locations where 
deprecated  APIs are used
    [javac]   -classpath <path>         Specify where to find user class 
files
    [javac]   -sourcepath <path>        Specify where to find input 
source files

    [javac]   -bootclasspath <path>     Override location of bootstrap 
class files
    [javac]   -extdirs <dirs>           Override location of installed 
extensions
    [javac]   -d <directory>            Specify where to place generated 
class files
    [javac]   -encoding <encoding>      Specify character encoding used 
by source files
    [javac]   -source <release>         Provide source compatibility 
with specified release
    [javac]   -target <release>         Generate class files for 
specific VM version
    [javac]   -help                     Print a synopsis of standard options

BUILD FAILED
D:\MyWorkSpace_2\WCK\wck\build.xml:87: Compile failed; see the compiler 
error ou
tput for details.

Can you help me?