Groovy script failed！

[przygrubyu5]

Hello, I got an error while running the script, I am using clean-up-all-by-sprint-numbers.groovy.

version info: Jenkins2.190.3 Groovy Postbuild | org.jvnet.hudson.plugins:groovy-postbuild:2.5

Error running the task：

Groovy script failed: groovy.lang.MissingPropertyException: No such property: workspace for class: org.jenkinsci.plugins.workflow.job.WorkflowJob at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:53) at org.codehaus.groovy.runtime.callsite.GetEffectivePojoPropertySite.getProperty(GetEffectivePojoPropertySite.java:66) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:296) at Script1.run(Script1.groovy:17) at groovy.lang.GroovyShell.evaluate(GroovyShell.java:585) at groovy.lang.GroovyShell.evaluate(GroovyShell.java:623) at groovy.lang.GroovyShell.evaluate(GroovyShell.java:594) at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript.evaluate(SecureGroovyScript.java:375) at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript.evaluate(SecureGroovyScript.java:312) at org.jvnet.hudson.plugins.groovypostbuild.GroovyPostbuildRecorder.perform(GroovyPostbuildRecorder.java:406) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741) at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690) at hudson.model.Build$BuildExecution.post2(Build.java:186) at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635) at hudson.model.Run.execute(Run.java:1841) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:97) at hudson.model.Executor.run(Executor.java:429)