err.txt

[INFO] Executing: /bin/sh -c cd /Users/enebo/work/warbler/ext/jetty/target/checkout/ext/jetty && /usr/local/Cellar/maven/3.2.1/libexec/bin/mvn -s /var/folders/l7/tj0fg3xx23qddznqx0v57h540000gn/T/release-settings6047635915784015987.xml deploy --no-plugin-updates -Psonatype-oss-release -P release -f pom.xml
    [WARNING] Command line option -npu is deprecated and will be removed in future Maven versions.
    [INFO] Scanning for projects...
    [ERROR] The build could not read 1 project -> [Help 1]
    [ERROR]   
    [ERROR]   The project org.jruby.warbler:warbler-embedded-jetty:2.0.0-SNAPSHOT (/Users/enebo/work/warbler/ext/jetty/target/checkout/ext/jetty/pom.xml) has 3 errors
    [ERROR]     'build.plugins.plugin.version' for org.apache.maven.plugins:maven-source-plugin must be a valid version but is '${source.plugin.version}'. @ line 144, column 22
    [ERROR]     'build.plugins.plugin.version' for org.apache.maven.plugins:maven-javadoc-plugin must be a valid version but is '${javadoc.plugin.version}'. @ line 157, column 22
    [ERROR]     'build.plugins.plugin.version' for org.apache.maven.plugins:maven-gpg-plugin must be a valid version but is '${gpg.plugin.version}'. @ line 170, column 22
    [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/ProjectBui