Cannot generate pdf report on Redhat 7

Graylog Central (peer support)
1

I have installed graylog server with enterprise plugins on Redhat 7 64 bit. I want to use Report function. but it give error when I schedule sending report and testing send now. I googled with few articles and problem might related to chrome headless generate pdf.
ERROR Logs:

[SystemJobManager] Submitted SystemJob <1593a3c0-1811-11eb-9e4a-005056a1d037> [org.graylog.plugins.report.scheduler.ReportRenderSystemJob]
2020-10-27T11:58:42.050+07:00 INFO  [BrowserDriverService] Starting report render engine: http://localhost:9515
2020-10-27T11:58:42.056+07:00 ERROR [ReportService] Failed to shutdown report render engine, process unavailable.
2020-10-27T11:58:42.060+07:00 ERROR [EmailReportSender] Failed to send report:
2020-10-27T11:58:42.060+07:00 ERROR [ReportRenderJob] Failed to send report:
javax.mail.SendFailedException: Couldn't deliver email!
        at org.graylog.plugins.report.sender.EmailReportSender.sendTo(EmailReportSender.java:51) ~[graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog.plugins.report.api.ReportService.sendEmails(ReportService.java:276) ~[graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog.plugins.report.scheduler.ReportRenderJob.doRun(ReportRenderJob.java:91) [graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog.plugins.report.scheduler.ReportRenderJob.run(ReportRenderJob.java:60) [graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog.plugins.report.scheduler.ReportRenderSystemJob.execute(ReportRenderSystemJob.java:25) [graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog2.system.jobs.SystemJobManager$1.run(SystemJobManager.java:89) [graylog.jar:?]
        at com.codahale.metrics.InstrumentedScheduledExecutorService$InstrumentedRunnable.run(InstrumentedScheduledExecutorService.java:241) [graylog.jar:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_252]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_252]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_252]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_252]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_252]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_252]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
Caused by: java.io.FileNotFoundException: Couldn't access PDF file!
        at org.graylog.plugins.report.sender.EmailReportSender.sendEmail(EmailReportSender.java:81) ~[graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog.plugins.report.sender.EmailReportSender.sendEmails(EmailReportSender.java:65) ~[graylog-plugin-enterprise-3.3.8.jar:?]
        at org.graylog.plugins.report.sender.EmailReportSender.sendTo(EmailReportSender.java:49) ~[graylog-plugin-enterprise-3.3.8.jar:?]
        ... 13 more
2020-10-27T11:58:42.067+07:00 INFO  [SystemJobManager] SystemJob <1593a3c0-1811-11eb-9e4a-005056a1d037> [org.graylog.plugins.report.scheduler.ReportRenderSystemJob] finished in 22ms.
2

Probably PDF file was not created at all, or bad path defined?:

FileNotFoundException: Couldn't access PDF file!
3

I didn’t see PDF file created

4

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