Error building project with bilbioteca Commons-Email-1.4

In my project I needed to add the option to send emails I added the library commons-email-1.4 I wrote all the code and tested. So far everything is perfect however when cleaning and building the application .jar file, here is the error.

ant -f C:\Users\Clayton\Documents\NetBeansProjects\Agil307 - Dnb.internal.action.name=rebuild clean jar
init:
deps-clean:
Updating property file: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\built-clean.properties
Deleting directory C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build
clean:
init:
deps-jar:
Created dir: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build
Updating property file: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\built-jar.properties
Created dir: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\classes
Created dir: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\classes\META-INF
Copying 1 file to C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\classes\META-INF
Created dir: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\empty
Created dir: C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\generated-sources\ap-source-output
Compiling 401 source files to C:\Users\Clayton\Documents\NetBeansProjects\Agil307\build\classes
C:\Users\Clayton\Documents\NetBeansProjects\Agil307\nbproject\build-impl.xml:929: The following error occurred while executing this line:
C:\Users\Clayton\Documents\NetBeansProjects\Agil307\nbproject\build-impl.xml:269: Error running C:\Program Files\Java\jdk1.8.0_31\bin\javac.exe compiler
FALHA NA CONSTRUÇÃO (tempo total: 49 segundos)

Lines for the above errors in file build-impl.xml

 928<target depends="init,deps-jar,-pre-pre-compile,-pre-compile, -copy-persistence-xml,-compile-depend" if="have.sources" name="-do-compile">
 929   <j2seproject3:javac gensrcdir="${build.generated.sources.dir}"/>
 930      <copy todir="${build.classes.dir}">
 931         <fileset dir="${src.dir}" excludes="${build.classes.excludes},${excludes}" includes="${includes}"/>
 932      </copy>
 933</target>

  269<javac debug="@{debug}" deprecation="${javac.deprecation}" destdir="@{destdir}" encoding="${source.encoding}" excludes="@{excludes}" fork="${javac.fork}" includeantruntime="false" includes="@{includes}" source="${javac.source}" sourcepath="@{sourcepath}" srcdir="@{srcdir}" target="${javac.target}" tempdir="${java.io.tmpdir}">
  270           <src>
  271               <dirset dir="@{gensrcdir}" erroronmissingdir="false">
  272                   <include name="*"/>
  273               </dirset>
  274           </src>

If I remove the commons-email-1.4 library and remove the project code it builds smoothly.

I do not know what I can do to solve the problem.

Just for registration I'm using JDK 8.