java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.jenkinsci.test.acceptance.update_center.UpdateCenterMetadata.transitiveDependenciesOf(UpdateCenterMetadata.java:81)
at org.jenkinsci.test.acceptance.update_center.UpdateCenterMetadata.transitiveDependenciesOf(UpdateCenterMetadata.java:83)
at org.jenkinsci.test.acceptance.update_center.UpdateCenterMetadata.transitiveDependenciesOf(UpdateCenterMetadata.java:83)
at org.jenkinsci.test.acceptance.update_center.UpdateCenterMetadata.transitiveDependenciesOf(UpdateCenterMetadata.java:75)
at org.jenkinsci.test.acceptance.po.PluginManager.installPlugins(PluginManager.java:157)
at org.jenkinsci.test.acceptance.junit.WithPlugins$RuleImpl$1.doInstall(WithPlugins.java:141)
at org.jenkinsci.test.acceptance.junit.WithPlugins$RuleImpl$1.installPlugins(WithPlugins.java:121)
at org.jenkinsci.test.acceptance.junit.WithPlugins$RuleImpl$1.evaluate(WithPlugins.java:93)
at org.jenkinsci.test.acceptance.junit.JenkinsAcceptanceTestRule$1$2$1.evaluate(JenkinsAcceptanceTestRule.java:172)

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