Application: gvSIG desktop

In the addons manager, if you select the Installation from URL option, the following error is shown and the installation is not able to continue to the next step:

INFO [AWT-EventQueue-1] (MDIFrame.java:744) - ExtensionDecorator.execute('')
 INFO [AWT-EventQueue-1] (ExtensionDecorator.java:93) - InstallPackageExtension.execute('')
 WARN [AWT-EventQueue-1] (DefaultInstallPackageService.java:380) - 
Trying to add a package file ({0}) without a known file extension. Will try to add it as a package set
 INFO [AWT-EventQueue-1] (OptionPanelContainer.java:92) - It is not possible to continue with the wizard
org.gvsig.gui.beans.wizard.panel.NotContinueWizardException: _execute_adding_error
    at org.gvsig.installer.swing.impl.execution.wizard.SelectBundlesWizard.nextPanel(SelectBundlesWizard.java:101)
    at org.gvsig.gui.beans.wizard.panel.OptionPanelContainer.next(OptionPanelContainer.java:87)
    at jwizardcomponent.DefaultJWizardComponents.nextButton_actionPerformed(Unknown Source)
    at jwizardcomponent.DefaultJWizardComponents$2.actionPerformed(Unknown Source)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
    at java.awt.Component.processMouseEvent(Component.java:6288)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
    at java.awt.Component.processEvent(Component.java:6053)
    at java.awt.Container.processEvent(Container.java:2041)
    at java.awt.Component.dispatchEventImpl(Component.java:4651)
    at java.awt.Container.dispatchEventImpl(Container.java:2099)
    at java.awt.Component.dispatchEvent(Component.java:4481)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
    at java.awt.Container.dispatchEventImpl(Container.java:2085)
    at java.awt.Window.dispatchEventImpl(Window.java:2478)
    at java.awt.Component.dispatchEvent(Component.java:4481)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
    at java.awt.EventQueue.access$000(EventQueue.java:84)
    at java.awt.EventQueue$1.run(EventQueue.java:602)
    at java.awt.EventQueue$1.run(EventQueue.java:600)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
    at java.awt.EventQueue$2.run(EventQueue.java:616)
    at java.awt.EventQueue$2.run(EventQueue.java:614)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
    at org.gvsig.andami.ui.AndamiEventQueue.dispatchEvent(AndamiEventQueue.java:59)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: org.gvsig.installer.lib.impl.utils.Decompress$InstallerPluginReadErrorException: 
Error reading the plugin 'gvSIG-desktop-2.0.0-org.gvsig.annotation.app.extension-1.0.0-SNAPSHOT-2044-alpha4-all-all-j1_5.gvspkis'
    at org.gvsig.installer.lib.impl.utils.Decompress.decompressFolderOfPlugins(Decompress.java:240)
    at org.gvsig.installer.lib.impl.utils.Decompress.readPackageSetInstallInfos(Decompress.java:98)
    at org.gvsig.installer.lib.impl.DefaultInstallerProviderServices.readPackageSetInfo(DefaultInstallerProviderServices.java:163)
    at org.gvsig.installer.lib.impl.execution.DefaultInstallPackageService.addBundle(DefaultInstallPackageService.java:386)
    at org.gvsig.installer.lib.impl.execution.DefaultInstallPackageService.addBundle(DefaultInstallPackageService.java:444)
    at org.gvsig.installer.swing.impl.execution.wizard.SelectBundlesWizard.nextPanel(SelectBundlesWizard.java:88)
    ... 40 more
Caused by: org.gvsig.installer.lib.spi.InstallerInfoFileException: 
Error getting the value of the download url property as URL: 
../../pool/org.gvsig.annotation.app.extension/gvSIG-desktop-2.0.0-org.gvsig.annotation.app.extension-1.0.0-SNAPSHOT-2044-alpha4-all-all-j1_5.gvspkg
    at org.gvsig.installer.lib.impl.info.InstallerInfoFileReader.read(InstallerInfoFileReader.java:192)
    at org.gvsig.installer.lib.impl.utils.Decompress.readInstallInfo(Decompress.java:400)
    at org.gvsig.installer.lib.impl.utils.Decompress.readPlugin(Decompress.java:281)
    at org.gvsig.installer.lib.impl.utils.Decompress.decompressFolderOfPlugins(Decompress.java:231)
    ... 45 more
Caused by: java.net.MalformedURLException: no protocol: 
../../pool/org.gvsig.annotation.app.extension/gvSIG-desktop-2.0.0-org.gvsig.annotation.app.extension-1.0.0-SNAPSHOT-2044-alpha4-all-all-j1_5.gvspkg
    at java.net.URL.<init>(URL.java:567)
    at java.net.URL.<init>(URL.java:464)
    at java.net.URL.<init>(URL.java:413)
    at org.gvsig.installer.lib.impl.info.InstallerInfoFileReader.read(InstallerInfoFileReader.java:190)
    ... 48 more