java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.jenkinsci.test.acceptance.po.PluginManager.isInstalled(PluginManager.java:78)
at org.jenkinsci.test.acceptance.po.PluginManager.installPlugin(PluginManager.java:107)
at org.jenkinsci.test.acceptance.junit.WithPlugins$RuleImpl$1.installPlugins(WithPlugins.java:64)
at org.jenkinsci.test.acceptance.junit.WithPlugins$RuleImpl$1.evaluate(WithPlugins.java:57)
at org.jenkinsci.test.acceptance.junit.JenkinsAcceptanceTestRule$1.evaluate(JenkinsAcceptanceTestRule.java:50)

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