SCM command line error

Launching the scm cmd line, I got the following message:
"The IBM Class Sharing Adaptor will not work in this configuration.
You are not running on J9.
S c m :
A n e r r o r h a s o c c u r r e d . S e e t h e l o g f i l e..."

I tried with a sun jre 1.5.0 and with an IBM jre 1.5.0. I got the same error message and the same errors in the log file.

Here is an extract of the log file:

!SESSION 2008-07-10 12:40:35.531 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.5.0_15
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=it_IT
Command-line arguments: -os win32 -ws win32 -arch x86 -data @noDefault

!ENTRY org.eclipse.osgi 4 0 2008-07-10 12:40:35.765
!MESSAGE error loading hook: com.ibm.cds.CDSHookConfigurator
!STACK 0
java.lang.NullPointerException
at com.ibm.cds.CDSHookConfigurator.addHooks(CDSHookConfigurator.java:28)
at org.eclipse.osgi.baseadaptor.HookRegistry.loadConfigurators(Unknown Source)

...

!ENTRY org.eclipse.osgi 4 0 2008-07-10 12:40:35.937
!MESSAGE Startup error
!STACK 1
java.lang.VerifyError: (class: org/eclipse/osgi/framework/internal/core/ServiceRegistrationImpl$Properties$$Cold, method: cloneValue signature: (Ljava/lang/Object;)Ljava/lang/Object;) Bad access to protected data

...

!SESSION Thu Jul 10 12:40:36 CEST 2008 -----------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2008-07-10 12:40:36.015
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.NullPointerException
at org.eclipse.osgi.internal.baseadaptor.BaseStorage.readStateData(Unknown Source)


Could someone help me?

Thanks in advance.
Tullio