ConversionException: java.lang.ClassNotFoundException: org.jenkinsci.lib.envinject.service.EnvVarsResolver : java.lang.ClassNotFoundException: org.jenkinsci.lib.envinject.service.EnvVarsResolver ---- Debugging information ---- message : java.lang.ClassNotFoundException: org.jenkinsci.lib.envinject.service.EnvVarsResolver cause-exception : java.lang.RuntimeException cause-message : java.lang.ClassNotFoundException: org.jenkinsci.lib.envinject.service.EnvVarsResolver class : hudson.plugins.batch_task.BatchTask required-type : hudson.plugins.batch_task.BatchTask converter-type : hudson.util.RobustReflectionConverter path : /project/properties/hudson.plugins.batch_task.BatchTaskProperty/tasks/hudson.plugins.batch_task.BatchTask line number : 15 class[1] : [Lhudson.plugins.batch_task.BatchTask; converter-type[1] : com.thoughtworks.xstream.converters.collections.ArrayConverter -------------------------------, MissingFieldException: No field 'hudson.plugins.batch_task.BatchTask' found in class 'hudson.plugins.batch_task.BatchTaskProperty', MissingFieldException: No field 'hudson.plugins.batch_task.BatchTask' found in class 'hudson.plugins.batch_task.BatchTaskProperty'
Fixed in https://issues.jenkins-ci.org/browse/JENKINS-30820