Please help ! Error after install sonarqube - can't access web app [error 400 Bad request]

nothing into the logs here is some extract

es.log

2018.12.10 13:40:29 WARN es[o.e.c.r.a.DiskThresholdMonitor] high disk watermark [90%] exceeded on [Wkhu7PSsQJGLN__P6Uq2vA][sonarqube][/opt/sonarqube/sonarqube-7.4/data/es5/nodes/0] free: 1.7gb[9.2%], shards will be relocated away from this node

ce.log

2018.12.10 12:00:16 INFO ce[o.s.p.ProcessEntryPoint] Starting ce
2018.12.10 12:00:16 INFO ce[o.s.ce.app.CeServer] Compute Engine starting up…
2018.12.10 12:00:16 INFO ce[o.s.c.e.CoreExtensionsLoader] Loaded core extensions:
2018.12.10 12:00:17 INFO ce[o.e.p.PluginsService] no modules loaded
2018.12.10 12:00:17 INFO ce[o.e.p.PluginsService] loaded plugin [org.elasticsearch.join.ParentJoinPlugin]
2018.12.10 12:00:17 INFO ce[o.e.p.PluginsService] loaded plugin [org.elasticsearch.percolator.PercolatorPlugin]
2018.12.10 12:00:17 INFO ce[o.e.p.PluginsService] loaded plugin [org.elasticsearch.transport.Netty4Plugin]
2018.12.10 12:00:18 INFO ce[o.s.s.e.EsClientProvider] Connected to local Elasticsearch: [127.0.0.1:9001]
2018.12.10 12:00:18 INFO ce[o.sonar.db.Database] Create JDBC data source for jdbc:postgresql://localhost/sonar
2018.12.10 12:00:19 INFO ce[o.s.s.p.ServerFileSystemImpl] SonarQube home: /opt/sonarqube/sonarqube-7.4
2018.12.10 12:00:19 INFO ce[o.s.c.c.CePluginRepository] Load plugins
2018.12.10 12:00:20 WARN ce[o.s.c.p.ComponentKeys] Bad component key: org.sonar.java.externalreport.ExternalRulesDefinition@312c6750. Please implement toString() method on class org.sonar.java.externalreport.ExternalRulesDefinition
2018.12.10 12:00:20 WARN ce[o.s.c.p.ComponentKeys] Bad component key: org.sonar.java.externalreport.ExternalRulesDefinition@47cc62a9. Please implement toString() method on class org.sonar.java.externalreport.ExternalRulesDefinition
2018.12.10 12:00:20 WARN ce[o.s.c.p.ComponentKeys] Bad component key: org.sonar.java.externalreport.ExternalRulesDefinition@25a9c8ef. Please implement toString() method on class org.sonar.java.externalreport.ExternalRulesDefinition
2018.12.10 12:00:20 INFO ce[o.s.c.c.ComputeEngineContainerImpl] Running Community edition
2018.12.10 12:00:20 INFO ce[o.s.c.q.PurgeCeActivities] Delete the Compute Engine tasks created before 1528887620613
2018.12.10 12:00:20 INFO ce[o.s.c.q.PurgeCeActivities] Delete the Scanner contexts tasks created before 1542020420628
2018.12.10 12:00:20 INFO ce[o.s.ce.app.CeServer] Compute Engine is operational

can i have some vhost for apache2.4 examples please ?