I am new at LifeRay .. I am trying to install Liferay in my Eclipse Helios IDE which is not happening as it is throwing an error.The Error description is as follows.... please help regarding this,
An error occurred while collecting items to be installed
session context was
profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/plugins/com.liferay.ide.eclipse.doc_1.6.1.v201211020947.jar.
Read timed out
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/plugins/com.liferay.ide.eclipse.ui_1.6.1.v201211020947.jar.
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/plugins/com.liferay.ide.eclipse.ui.snippets_1.6.1.v201211020947.jar.
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/features/org.eclipse.sapphire.ui_0.5.4.201210261722.jar.
Read timed out
An error occurred while collecting items to be installed
session context was
profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/plugins/com.liferay.ide.eclipse.doc_1.6.1.v201211020947.jar.
Read timed out
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/plugins/com.liferay.ide.eclipse.ui_1.6.1.v201211020947.jar.
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/plugins/com.liferay.ide.eclipse.ui.snippets_1.6.1.v201211020947.jar.
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Unable to read repository at http://releases.liferay.com/tools/ide/eclipse/helios/stable/features/org.eclipse.sapphire.ui_0.5.4.201210261722.jar.
Read timed out
