java.lang.ClassNotFoundException: hudson.tasks.Mailer$UserProperty
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java.lang.ClassNotFoundException: hudson.tasks.Mailer$UserProperty
at hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1568)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.security.HudsonPrivateSecurityRealm.createAccount(HudsonPrivateSecurityRealm.java:373)
at hudson.security.HudsonPrivateSecurityRealm.doCreateFirstAccount(HudsonPrivateSecurityRealm.java:295)