Exception in thread "main" java.lang.NoC

Bonjour,

j ai une erreur "Exception in thread "main"java.lang.NoClassDefFoundError:" et je m en sors pas..Si quelqu un a une idee.. j ai installe Java Runtime Environment mais quand je test des java classes en retour j ai le message d erreur exception...
C:\>java testnoviceExample frobert@dfpapi guinness1. betadfpapi
Exception in thread "main" java.lang.NoClassDefFoundError: com/doubleclick/dart/DartException

voila quelque info
C:\> set
ALLUSERSPROFILE=C:\Documents and Settings\All Users
APPDATA=C:\Documents and Settings\frobert\Application Data
CommonProgramFiles=C:\Program Files\Common Files
COMPUTERNAME=DE-HAM-PC013
ComSpec=C:\WINDOWS\system32\cmd.exe
FP_NO_HOST_CHECK=NO
HOMEDRIVE=C:
HOMEPATH=\Documents and Settings\frobert
LOGONSERVER=\\IE-DUB-DC002
NUMBER_OF_PROCESSORS=1
OS=Windows_NT
Path=C:\Program Files\ThinkPad\Utilities;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDO
WS\System32\Wbem;C:\Program Files\ATI Technologies\ATI Control Panel;C:\Program
Files\Intel\Wireless\Bin\;C:\Program Files\Java\j2re1.4.2_11\bin;C:\Program File
s\Java\j2re1.4.2_11\bin;C:\dartapi\lib
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
PROCESSOR_ARCHITECTURE=x86
PROCESSOR_IDENTIFIER=x86 Family 6 Model 9 Stepping 5, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=0905
ProgramFiles=C:\Program Files
PROMPT=$P$G
SESSIONNAME=Console
SystemDrive=C:
SystemRoot=C:\WINDOWS
TEMP=C:\DOCUME~1\frobert\LOCALS~1\Temp
TMP=C:\DOCUME~1\frobert\LOCALS~1\Temp
USERDOMAIN=EUDOM
USERNAME=frobert
USERPROFILE=C:\Documents and Settings\frobert
windir=C:\WINDOWS
===


merci
frederic