When updating a generated job I get:

FATAL: Jenkins already contains an item 'XCSDK_prod_xcloud_python27_Functional_Tests'
java.lang.IllegalArgumentException: Jenkins already contains an item 'MyGeneratedJob'
at hudson.model.ItemGroupMixIn.createProjectFromXML(ItemGroupMixIn.java:227)
at jenkins.model.Jenkins.createProjectFromXML(Jenkins.java:2944)
at org.jenkinsci.plugins.jobgenerator.GeneratorRun$GeneratorImpl.doRun(GeneratorRun.java:424)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:566)
at hudson.model.Run.execute(Run.java:1677)
at org.jenkinsci.plugins.jobgenerator.GeneratorRun.run(GeneratorRun.java:281)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)
at hudson.model.OneOffExecutor.run(OneOffExecutor.java:43)