Failed to start embedded Tomcat

[Ingvord]

DEBUG 2020-05-28 12:01:16,984 [localhost-startStop-1 -  - h.w.x.ResourceManager] hzg.wpn.xenv.ResourceManager.loadResource:59 - Trying to load resource /home/khokhria/bin/HeadQuarter/etc/PreExperimentDataCollector/application.properties
DEBUG 2020-05-28 12:01:16,985 [localhost-startStop-1 -  - h.w.x.ResourceManager] hzg.wpn.xenv.ResourceManager.loadResource:65 - Reading from the classpath...
DEBUG 2020-05-28 12:01:16,985 [localhost-startStop-1 -  - h.w.x.ResourceManager] hzg.wpn.xenv.ResourceManager.loadProperties:53 - Successfully load properties!
DEBUG 2020-05-28 12:01:16,986 [localhost-startStop-1 -  - h.w.x.ResourceManager] hzg.wpn.xenv.ResourceManager.loadResource:59 - Trying to load resource /home/khokhria/bin/HeadQuarter/etc/PreExperimentDataCollector/meta.yaml
DEBUG 2020-05-28 12:01:16,986 [localhost-startStop-1 -  - h.w.x.ResourceManager] hzg.wpn.xenv.ResourceManager.loadResource:62 - Reading from the file system...
INFO 2020-05-28 12:01:17,135 [main - test/xenv/predator - h.w.p.w.ApplicationLoader] h.wpn.predator.web.ApplicationLoader.initializeWebapp:107 - Adding webapp /home/khokhria/bin/HeadQuarter/var/predator/ROOT.war
ERROR 2020-05-28 12:01:17,137 [main - test/xenv/predator - o.t.s.d.InitImpl] org.tango.server.device.InitImpl.manageInitError:196 - Init failed
java.lang.IllegalArgumentException: addChild:  Child name '' is not unique
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:885)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
        at org.apache.catalina.startup.Tomcat.addWebapp(Tomcat.java:587)
        at org.apache.catalina.startup.Tomcat.addWebapp(Tomcat.java:542)
        at org.apache.catalina.startup.Tomcat.addWebapp(Tomcat.java:215)
        at hzg.wpn.predator.web.ApplicationLoader.initializeWebapp(ApplicationLoader.java:109)
        at hzg.wpn.tango.PreExperimentDataCollector$TomcatStarterTask.run(PreExperimentDataCollector.java:300)
        at hzg.wpn.tango.PreExperimentDataCollector.init(PreExperimentDataCollector.java:242)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.tango.server.device.InitImpl.doInit(InitImpl.java:164)
        at org.tango.server.device.InitImpl.execute(InitImpl.java:127)
        at org.tango.server.servant.DeviceImpl.doInit(DeviceImpl.java:632)
        at org.tango.server.servant.DeviceImpl.initDevice(DeviceImpl.java:674)
        at org.tango.server.build.DeviceBuilder.createDevice(DeviceBuilder.java:127)
        at org.tango.server.build.DeviceClassBuilder.buildDevice(DeviceClassBuilder.java:70)
        at org.tango.server.export.TangoExporter.buildDevice(TangoExporter.java:228)
        at org.tango.server.export.TangoExporter.exportDevices(TangoExporter.java:118)
        at org.tango.server.export.TangoExporter.exportAll(TangoExporter.java:87)
        at org.tango.server.ServerManager.init(ServerManager.java:260)
        at org.tango.server.ServerManager.start(ServerManager.java:223)
        at hzg.wpn.tango.PreExperimentDataCollector.main(PreExperimentDataCollector.java:100)