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The UC on http://plugins.netbeans.org/nbpluginportal/files/nbms/pluginportal-update-center.xml (not part of NB6 FCS!) contains invalid record with empty content. DTD validation fails on that catalog XML. XML validation started. Checking file:/tmp/pluginportal-update-center.xml... Referenced entity at "http://www.netbeans.org/dtds/autoupdate-catalog-2_3.dtd". Attribute "OpenIDE-Module" is required and must be specified for element type "manifest". [889] Attribute "OpenIDE-Module-Name" is required and must be specified for element type "manifest". [889] Attribute "OpenIDE-Module-Specification-Version" is required and must be specified for element type "manifest". [889] XML validation finished. This problem make serious problems in Plugin Manager for users who have that UC subsrcibed.
Fixed. In order to fix this in NB 6.0, you must remove the UC and re-add it.