Unable to install certificate on graylog server

Hi,

We installed graylog 4.0 on ubuntu 18.04.
We follow below link to install certificate:
https://docs.graylog.org/en/2.2/pages/configuration/https.html?highlight=https
After placing certificate in desired location and making required changes in conf file, we restarted graylg service.

We are facing below error:

2021-01-04T17:47:28.995+05:30 ERROR [CmdLineTool] Invalid configuration
com.github.joschi.jadconfig.ValidationException: Unreadable or missing HTTP private key: null
at org.graylog2.configuration.HttpConfiguration.validateTlsConfig(HttpConfiguration.java:252) ~[graylog.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_275]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_275]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_275]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_275]
at com.github.joschi.jadconfig.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:53) ~[graylog.jar:?]
at com.github.joschi.jadconfig.JadConfig.invokeValidatorMethods(JadConfig.java:221) ~[graylog.jar:?]
at com.github.joschi.jadconfig.JadConfig.process(JadConfig.java:100) ~[graylog.jar:?]
at org.graylog2.bootstrap.CmdLineTool.processConfiguration(CmdLineTool.java:353) [graylog.jar:?]
at org.graylog2.bootstrap.CmdLineTool.readConfiguration(CmdLineTool.java:346) [graylog.jar:?]
at org.graylog2.bootstrap.CmdLineTool.run(CmdLineTool.java:180) [graylog.jar:?]
at org.graylog2.bootstrap.Main.main(Main.java:50) [graylog.jar:?]

Please help us out here.

Check the private key… Make sure the graylog user is able to read the file.

Also, you have said you are running v4.0 however, you have linked to the documentation for v2.2…
Please see: https://docs.graylog.org/en/4.0/pages/configuration/https.html

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