Could please help me, when ever we install the gray log become this type of errors

Caused by: java.lang.RuntimeException: Could not parse URI.
at org.graylog2.plugin.Tools.getUriWithScheme(Tools.java:541) ~[graylog.jar:?]
at org.graylog2.plugin.Tools.lambda$normalizeURI$0(Tools.java:593) ~[graylog.jar:?]
at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_222]
at org.graylog2.plugin.Tools.normalizeURI(Tools.java:593) ~[graylog.jar:?]
at org.graylog2.configuration.HttpConfiguration.getHttpPublishUri(HttpConfiguration.java:118) ~[graylog.jar:?]
at org.graylog2.configuration.HttpConfiguration.validateHttpPublishUriPathEndsWithSlash(HttpConfiguration.java:234) ~[graylog.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
at com.github.joschi.jadconfig.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:53) ~[graylog.jar:?]
at com.github.joschi.jadconfig.JadConfig.invokeValidatorMethods(JadConfig.java:221) ~[graylog.jar:?]
… 5 more
Caused by: java.net.URISyntaxException: Expected scheme-specific part at index 5: http:
at java.net.URI$Parser.fail(URI.java:2848) ~[?:1.8.0_222]
at java.net.URI$Parser.failExpecting(URI.java:2854) ~[?:1.8.0_222]
at java.net.URI$Parser.parse(URI.java:3057) ~[?:1.8.0_222]
at java.net.URI.(URI.java:673) ~[?:1.8.0_222]
at org.graylog2.plugin.Tools.getUriWithScheme(Tools.java:539) ~[graylog.jar:?]
at org.graylog2.plugin.Tools.lambda$normalizeURI$0(Tools.java:593) ~[graylog.jar:?]
at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_222]
at org.graylog2.plugin.Tools.normalizeURI(Tools.java:593) ~[graylog.jar:?]
at org.graylog2.configuration.HttpConfiguration.getHttpPublishUri(HttpConfiguration.java:118) ~[graylog.jar:?]
at org.graylog2.configuration.HttpConfiguration.validateHttpPublishUriPathEndsWithSlash(HttpConfiguration.java:234) ~[graylog.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
at com.github.joschi.jadconfig.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:53) ~[graylog.jar:?]
at com.github.joschi.jadconfig.JadConfig.invokeValidatorMethods(JadConfig.java:221) ~[graylog.jar:?]
… 5 more

What is the value of http_publish_uri in your server.conf file?

http_publish_uri = http://ip:9000

Try putting a / at the end of that…

http_publish_uri = http://ip:9000/