When i build hive according to instructions from https://lens.apache.org/lenshome/install-and-run.html it gives errors when building the project


[INFO] Hive HCatalog Server Extensions .................... SUCCESS [  2.592 s]
[INFO] Hive HCatalog Webhcat Java Client .................. SUCCESS [  1.996 s]
[INFO] Hive HCatalog Webhcat .............................. FAILURE [  5.603 s]
[INFO] Hive HCatalog Streaming ............................ SKIPPED
[INFO] Hive HWI ........................................... SKIPPED
[INFO] Hive ODBC .......................................... SKIPPED
[INFO] Hive Shims Aggregator .............................. SKIPPED
[INFO] Hive TestUtils ..................................... SKIPPED
[INFO] Hive Packaging ..................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 03:47 min
[INFO] Finished at: 2016-03-06T01:11:00-08:00
[INFO] Final Memory: 132M/367M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.4
:javadoc (resourcesdoc.xml) on project hive-webhcat: An error has occurred in Ja
vaDocs report generation:Exit code: 1 - javadoc: error - Illegal package name: "
drills\hive"
[ERROR] javadoc: error - Illegal package name: "build\hive-hive-release-0.13.4-i
nm\hcatalog\webhcat\svr\target\classes/resourcedoc.xml"
[ERROR] javadoc: warning - No source files for package with
[ERROR]
[ERROR] Command line was:"C:\Program Files\Java\jdk1.8.0_11\jre\..\bin\javadoc.e
xe" @options @packages
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionE
xception
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command

[ERROR]   mvn <goals> -rf :hive-webhcat

can someone please explain the reason.