Compilation error occurred while building.

Defect : Compilation error occurred while building.

Logs :
mvn clean install
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building onlab-test 1.7.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] — maven-clean-plugin:2.5:clean (default-clean) @ onlab-test —
[INFO] Deleting /opt/onos-master/onos/utils/test/target
[INFO]
[INFO] — jacoco-maven-plugin:0.7.5.201505241946:prepare-agent (default-prepare-agent) @ onlab-test —
[INFO] argLine set to -javaagent:/home/root1/.m2/repository/org/jacoco/org.jacoco.agent/0.7.5.201505241946/org.jacoco.agent-0.7.5.201505241946-runtime.jar=destfile=/opt/onos-master/onos/utils/test/target/jacoco.exec -Duser.language=en -Duser.region=US
[INFO]
[INFO] — yangutils-maven-plugin:1.0.0-SNAPSHOT:yang2java (default) @ onlab-test —
[INFO] Source directory added to compilation root: /opt/onos-master/onos/utils/test/src/main/java
[INFO]
[INFO] — maven-resources-plugin:2.7:resources (default-resources) @ onlab-test —
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /opt/onos-master/onos/utils/test/src/main/resources
[INFO] Copying 2 resources
[INFO] Copying 2 resources
[INFO]
[INFO] — maven-compiler-plugin:2.5.1:compile (default-compile) @ onlab-test —
[INFO] Compiling 29 source files to /opt/onos-master/onos/utils/test/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Event.java:[19,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Event.java:[24,35] error: cannot find symbol
[ERROR] symbol: class AbstractEvent
/opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Listener.java:[19,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Listener.java:[24,42] error: cannot find symbol
[ERROR] symbol: class EventListener
/opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[24,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[41,16] error: cannot find symbol
[ERROR] symbol: class ListenerRegistry
/opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[20,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[32,16] error: cannot find symbol
[INFO] 8 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.011 s
[INFO] Finished at: 2016-06-30T19:19:30+05:30
[INFO] Final Memory: 29M/323M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project onlab-test: Compilation failure: Compilation failure:
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Event.java:[19,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Event.java:[24,35] error: cannot find symbol
[ERROR] symbol: class AbstractEvent
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Listener.java:[19,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/siltest3/Siltest3Listener.java:[24,42] error: cannot find symbol
[ERROR] symbol: class EventListener
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[24,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Manager.java:[41,16] error: cannot find symbol
[ERROR] symbol: class ListenerRegistry
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[20,28] error: package org.onosproject.event does not exist
[ERROR] /opt/onos-master/onos/utils/test/src/main/java/org/onosproject/yang/gen/v1/http/netconfcentral/org/ns/siltest3/rev20110916/Siltest3Service.java:[32,16] error: cannot find symbol
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
root1@root1-HP-EliteBook-840-G2:/opt/onos-master/onos/utils/test$