[news.eclipse.newcomer] Error after ganymede update

[sandman42 <ciccio@xxxxxxxxx>]

Hi,

I've downloaded ganymede for windows, Java EE Developers version, 
installed and it worked fine.

I've updated it, and it does not working anymore: it complains for an 
error and says "An error has occourred. See the log file".

In the log file I have the following errors:

!SESSION 2009-03-16 16:28:35.008 
-----------------------------------------------
eclipse.buildId=M20090211-1700
java.version=1.6.0_03
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=it_IT
Framework arguments:  256M
Command-line arguments:  -os win32 -ws win32 -arch x86 256M

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:46.684
!MESSAGE Unable to access file 
"plugins/org.eclipse.datatools.sqltools.sqlbuilder_1.0.0.v200901280650.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:46.975
!MESSAGE Unable to access file 
"plugins/org.eclipse.equinox.p2.metadata.generator_1.0.4.v20081217.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.095
!MESSAGE Unable to access file 
"plugins/org.eclipse.jdt.core_3.4.4.v_894_R34x.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.125
!MESSAGE Unable to access file 
"plugins/org.eclipse.jdt.doc.user_3.4.2.r342_v20081119-0800.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.205
!MESSAGE Unable to access file 
"plugins/org.eclipse.jdt.ui_3.4.2.r342_v20090107-0800.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.275
!MESSAGE Unable to access file 
"plugins/org.eclipse.jface_3.4.2.M20090107-0800.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.385
!MESSAGE Unable to access file 
"plugins/org.eclipse.jst.j2ee.core_1.1.203.v200901221030.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.886
!MESSAGE Unable to access file 
"plugins/org.eclipse.pde.doc.user_3.3.1.r342_v20081024.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:47.966
!MESSAGE Unable to access file 
"plugins/org.eclipse.platform.doc.user_3.4.2.r342_v20081031-0800.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:48.397
!MESSAGE Unable to access file 
"plugins/org.eclipse.wst.jsdt.core_1.0.104.v200901281939.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:48.437
!MESSAGE Unable to access file 
"plugins/org.eclipse.wst.jsdt.doc_1.0.103.v200810081720.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:48.447
!MESSAGE Unable to access file 
"plugins/org.eclipse.wst.jsdt.support.ie_1.0.103.v200810021840.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:48.457
!MESSAGE Unable to access file 
"plugins/org.eclipse.wst.jsdt.ui_1.0.104.v200901290004.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:48.607
!MESSAGE Unable to access file 
"plugins/org.eclipse.wst.ws.explorer_1.0.309.v200901271844.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.update.configurator 4 0 2009-03-16 16:28:48.627
!MESSAGE Unable to access file 
"plugins/org.eclipse.wst.wsdl.ui.doc.user_1.0.550.v200901232040.jar!META-INF/MANIFEST.MF".

!ENTRY org.eclipse.equinox.app 0 0 2009-03-16 16:28:48.887
!MESSAGE Product org.eclipse.platform.ide could not be found.

!ENTRY org.eclipse.equinox.p2.reconciler.dropins 4 0 2009-03-16 16:28:48.947
!MESSAGE
!STACK 0
org.osgi.framework.BundleException: The bundle could not be resolved. 
Reason: Missing Constraint: Import-Package: 
org.eclipse.equinox.internal.p2.extensionlocation; version="0.0.0"
	at 
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:305)
	at 
org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:355)
	at 
org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1074)
	at 
org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:616)
	at 
org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:508)
	at 
org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:299)
	at 
org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:489)
	at 
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:211)
	at 
org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:321)

These are only the beginning.

What's wrong?

How can I fix it?

Thanks in advance