Natasha Stopa We are using Manage Jenkins-->Manage Plugin view to install and manage plugins Mark Waite As seen we have few warnings and manage plugin has updates. On navigating to manage plugins view we are seeing the issues.The page doesn't load and fails with the javascript error as mentioned in the= bug description, we have restarted the jenkins server as well and still the issue persists. Also i could see this error here were errors checking the update sites: IllegalArgumentException: Could not find (numeric) updateCenterVersion in {"ui":{"activeCategories":[],"activeLabels":[],"activeQuery":"","firstVisit":true,"isFetchingPlugin":false,"isFiltered":false,"isSearching":false,"limit":50,"page":1,"pages":1,"plugin":{"firstRelease":"2012-02-15T22:57:19.00Z","buildDate":"2015-12-11","categories":[],"dependencies":[ {"name":"mailer","title":"Mailer","optional":false,"version":"1.16","implied":false} , {"name":"bouncycastle-api","title":"bouncycastle API","optional":false,"version":"2.16.0","implied":true} , {"name":"command-launcher","title":"Command Agent Launcher","optional":false,"version":"1.0","implied":true} , {"name":"jdk-tool","title":"Oracle Java SE Development Kit Installer","optional":false,"version":"1.0","implied":true} , {"name":"jaxb","title":"JAXB","optional":false,"version":"2.3.0","implied":true} , {"name":"trilead-api","title":"Trilead 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