org.jenkinsci.test.acceptance.po.UpdateCenter$InstallationFailedException: failed, see log
	at org.jenkinsci.test.acceptance.po.UpdateCenter.isInstalled(UpdateCenter.java:50)
	at org.jenkinsci.test.acceptance.po.UpdateCenter$1.call(UpdateCenter.java:73)
	at org.jenkinsci.test.acceptance.po.UpdateCenter$1.call(UpdateCenter.java:70)
	at org.jenkinsci.test.acceptance.junit.Wait$1.apply(Wait.java:78)
	at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:238)
	at org.jenkinsci.test.acceptance.junit.Wait.until(Wait.java:74)
	at org.jenkinsci.test.acceptance.po.UpdateCenter.waitForInstallationToComplete(UpdateCenter.java:70)
	at org.jenkinsci.test.acceptance.po.PluginManager.installPlugins(PluginManager.java:206)
	at org.jenkinsci.test.acceptance.junit.WithPlugins$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:92)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.jenkinsci.test.acceptance.junit.JenkinsAcceptanceTestRule$1$2$1.evaluate(JenkinsAcceptanceTestRule.java:172)
	at org.jenkinsci.test.acceptance.junit.FilterRule$1.evaluate(FilterRule.java:63)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.jenkinsci.test.acceptance.junit.JenkinsAcceptanceTestRule$1.evaluate(JenkinsAcceptanceTestRule.java:60)
...

...
master54727|Sep 03, 2016 9:30:38 PM hudson.PluginManager dynamicLoad
master54727|INFO: Attempting to dynamic load /scratch/jenkins/workspace/core/acceptance-test-harness-stable/jenkins6214212410789716894home/plugins/cloudbees-folder.jpi
master54727|Sep 03, 2016 9:30:38 PM hudson.model.UpdateCenter$DownloadJob run
master54727|SEVERE: Failed to install cloudbees-folder
master54727|java.io.IOException: Failed to dynamically deploy this plugin
master54727|	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1883)
master54727|	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1640)
master54727|	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
master54727|	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
master54727|	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
master54727|	at java.lang.Thread.run(Thread.java:745)
master54727|Caused by: java.io.IOException: Failed to install cloudbees-folder plugin
master54727|	at hudson.PluginManager.dynamicLoad(PluginManager.java:873)
master54727|	at hudson.PluginManager.dynamicLoad(PluginManager.java:813)
master54727|	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1879)
master54727|	... 5 more
master54727|Caused by: java.io.IOException: Folders Plugin v5.12 failed to load.
master54727| - Credentials Plugin v1.18 is older than required. To fix, install v2.0.4 or later.
master54727|	at hudson.PluginWrapper.resolvePluginDependencies(PluginWrapper.java:621)
master54727|	at hudson.PluginManager.dynamicLoad(PluginManager.java:863)
master54727|	... 7 more
...