Unable to access jarfile

When compiling TRACER with Apache Ant, it is important you use the command ant *only* and not ant verbose or other Ant commands. Although using ant verbose or similar will produce a successful build of TRACER, the execution of TRACER after this build will return the following error:

C:\Users\*anonymous*\Downloads\tracer>java -Xmx600m -Deu.etrap.medusa.config.ClassConfig=conf/tracer_config.xml -jar tracer.jar
Error: Unable to access jarfile tracer.jar

This is because the tracer.jar file generated from the Ant build is not complete (it should be some 33MB in size).