Error al ejecutar app tetris viritin

Como les va? cuando intento correr esta app https://https://github.com/samie/VaadinTetris  desde jetty , me da este error desde consola

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:55 min
[INFO] Finished at: 2016-10-19T08:57:57-04:30
[INFO] Final Memory: 14M/117M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.vaadin.wscdn:wscdn-maven-plugin:0.0.1:generate (default) on project tetris: Remote widgetset compilation failed:  (no response) -> [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/MojoExecutionException
rubn@rubnPC:~/VaadinTetris$ open http://localhost:8888/

y al importar en eclipce tambien pero esta vez, distinto.

[INFO] Scanning for projects...
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be resolved: Failure to find org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
[INFO] Downloading: http://oss.sonatype.org/content/repositories/vaadin-snapshots/org/codehaus/mojo/maven-metadata.xml
[INFO] Downloading: http://oss.sonatype.org/content/repositories/vaadin-snapshots/org/apache/maven/plugins/maven-metadata.xml
[INFO] Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
[INFO] Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
[INFO] Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (13 KB at 6.1 KB/sec)
[INFO] Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 KB at 8.2 KB/sec)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.961 s
[INFO] Finished at: 2016-10-19T08:50:05-04:30
[INFO] Final Memory: 10M/119M
[INFO] ------------------------------------------------------------------------
[ERROR] No plugin found for prefix 'vaadin' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/home/rubn/.m2/repository), vaadin-snapshots (http://oss.sonatype.org/content/repositories/vaadin-snapshots/), central (https://repo.maven.apache.org/maven2)] -> [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/NoPluginFoundForPrefixException