[INFO] ------------------------------------------------------------------------

[INFO] Building groupon-site-web 1.0

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ groupon-site-web ---

[INFO] Deleting D:\GitHub\s93-3632141\workspace\Site\Web\target

[INFO]

[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ groupon-site-web ---

[WARNING] File encoding has not been set, using platform encoding MS932, i.e. build is platform dependent!

[WARNING] Using platform encoding (MS932 actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory D:\GitHub\s93-3632141\workspace\Site\Web\src\main\java

[INFO]

[INFO] --- maven-compiler-plugin:3.2:compile (default-compile) @ groupon-site-web ---

[INFO] No sources to compile

[INFO]

[INFO] >>> maven-source-plugin:2.1:jar (default) > generate-sources @ groupon-site-web >>>

[INFO]

[INFO] <<< maven-source-plugin:2.1:jar (default) < generate-sources @ groupon-site-web <<<

[INFO]

[INFO] --- maven-source-plugin:2.1:jar (default) @ groupon-site-web ---

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary:

[INFO]

[INFO] groupon ............................................ SUCCESS [  1.839 s]

[INFO] groupon-service .................................... SUCCESS [ 12.086 s]

[INFO] groupon-site ....................................... SUCCESS [  0.022 s]

[INFO] groupon-site-controller ............................ SUCCESS [  3.429 s]

[INFO] groupon-site-web ................................... FAILURE [  0.145 s]

[INFO] groupon-admin ...................................... SKIPPED

[INFO] groupon-admin-controller ........................... SKIPPED

[INFO] groupon-admin-web .................................. SKIPPED

[INFO] groupon-image-server ............................... SKIPPED

[INFO] road-alipay ........................................ SKIPPED

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 17.796 s

[INFO] Finished at: 2017-04-12T12:04:15+09:00

[INFO] Final Memory: 27M/243M

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-source-plugin:2.1:jar (default) on project groupon-site-web: Error creating source archive: You must set at least one file. -> [He

lp 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/MojoExecutionException

[ERROR]

[ERROR] After correcting the problems, you can resume the build with the command

[ERROR]   mvn <goals> -rf :groupon-site-web

这该怎么弄