I was updating Jenkins from version 2.7 to version 2.204. After the update I have a notification saying Manage Old Data with unreadable data with the following message:

ConversionException: Refusing to unmarshal log for security reasons; see https://jenkins.io/redirect/class-filter/ ---- Debugging information ---- class : java.io.PrintStream required-type : java.io.PrintStream converter-type : hudson.util.XStream2$BlacklistedTypesConverter path : /build/actions/org.jenkinsci.plugins.EnvironmentVarSetter/log line number : 60 -------------------------------

I also found out that the plugin Build Name Setter has a fix in version 1.6.8 and i updated all plugins including Build Name and Description Setter to version 2.0.3 but the issue and the notification is still present.