node {
    stage ('1') {
        writeFile(file: 'rules', text: 'error /(?i)error:/\n')
    }
    stage ('2') {
        echo "Error: tragedy"
    }
    stage ('3') {
        step([$class: 'LogParserPublisher', parsingRulesPath: 'rules', useProjectRule: true]);
    }
}

 
ERROR: Failed to parse console log

java.lang.NullPointerException

log-parser plugin ERROR: Cannot parse log pipe #4
java.lang.NullPointerException
	at hudson.FilePath.isAbsolute(FilePath.java:308)
	at hudson.FilePath.resolvePathIfRelative(FilePath.java:293)
	at hudson.FilePath.<init>(FilePath.java:284)
	at hudson.plugins.logparser.LogParserPublisher.perform(LogParserPublisher.java:125)
	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:80)
	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:67)
	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution$1$1.call(SynchronousNonBlockingStepExecution.java:50)
	at hudson.security.ACL.impersonate(ACL.java:290)
	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution$1.run(SynchronousNonBlockingStepExecution.java:47)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)