gs-loader caused an error

After I installed and configured stado, gs-loader caused following error.
It seems that Stado does not import ../lib/postgresql.jar(postgresql-9.2-1000.jdbc4.jar) and
could not connect Underlying Database.
Do you have any ideas why gs-loader caused an error ?

 ./gs-loader.sh -d dbname -u admin -p secret -f '|' -i tablename.file -t tablename
 SQLException: ERROR: java.lang.UnsupportedOperationException: The connection does not support COPY

Environment
  -OS CentOS 6.2
  -nstalled JDK 1.6, PostgreSQL 9.2 and Stado2.5
  -copied postgresql-9.2-1000.jdbc4.jar to ../lib/postgresql.jar
   (postgresql-9.2-1000.jdbc4.jar is a PostgreSQL JDBC latest version)

More Informations
  -psql COPY command to Agent Node works normally.
    cat tablefilename.file | psql -h dbhost -p 5432 -d __dbname__N2 -U stado -a -e -E -c "COPY tablename FROM STDIN DELIMITERS '|'"
  -gs-cmdline works normally.
    Stado-> INSERT INTO databasename VALUES( ...);
  -JAVA Program without Stado (imported only postgresql-9.2-1000.jdbc4.jar) works normally
    Class.forName("org.postgresql.Driver");
    con = DriverManager.getConnection(url, user, password);
    CopyManager cm = new CopyManager((BaseConnection) con);
    fw = new FileWriter("tablename.file");
    cm.copyIn("COPY tablename FROM STDIN DELIMITERS '|'", fw);