It worked yesterday, but today, the folder containing the artifacts is not compress anymore. Jenkins warns at config page:
Unreadable Data

It is acceptable to leave unreadable data in these files, as Jenkins will safely ignore it. To avoid the log messages at Jenkins startup you can permanently delete the unreadable data by resaving these files using the button below.

Type Name Error
hudson.model.FreeStyleBuild ReleaseWebApplication #50 CannotResolveClassException: org.jenkinsci.plugins.compress_artifacts.CompressingArtifactManager
hudson.model.FreeStyleBuild ReleaseWebApplication #51 CannotResolveClassException: org.jenkinsci.plugins.compress_artifacts.CompressingArtifactManager
hudson.model.FreeStyleBuild ReleaseWebApplication #48 CannotResolveClassException: org.jenkinsci.plugins.compress_artifacts.CompressingArtifactManager
hudson.model.FreeStyleBuild ReleaseWebApplication #47 CannotResolveClassException: org.jenkinsci.plugins.compress_artifacts.CompressingArtifactManager
jenkins.model.ArtifactManagerConfiguration CannotResolveClassException: org.jenkinsci.plugins.compress_artifacts.CompressingArtifactManagerFactory