java error in "rosmake roboearth"

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Hi guys!

I'm on a problem trying to compile roboearth package. I've follow the instruction posted on http://www.ros.org/wiki/roboearth, using rosinstall to download the package. When i try to compile the package with: "rosmake roboearth" i'll got a lot of error, i think that are related to some java problems. Here are the logs:

    /home/prisma/fuerte_workspace/stacks/knowrob/json_prolog/src/java/edu/tum/cs/ias/knowrob/json_prolog/PrologBindings.java:80: cannot find symbol
  symbol  : variable JSONUtils
  location: class edu.tum.cs.ias.knowrob.json_prolog.PrologBindings
                    if(JSONUtils.isArray(bdg)) {
                       ^
  /home/prisma/fuerte_workspace/stacks/knowrob/json_prolog/src/java/edu/tum/cs/ias/knowrob/json_prolog/PrologBindings.java:82: cannot find symbol
  symbol  : variable JSONArray
  location: class edu.tum.cs.ias.knowrob.json_prolog.PrologBindings
                        Term[] objs = JSONQuery.decodeJSONArray(JSONArray.fromObject(bdg));
                                                                ^
  /home/prisma/fuerte_workspace/stacks/knowrob/json_prolog/src/java/edu/tum/cs/ias/knowrob/json_prolog/PrologBindings.java:90: cannot find symbol
  symbol  : variable JSONUtils
  location: class edu.tum.cs.ias.knowrob.json_prolog.PrologBindings
                    } else if(JSONUtils.isObject(bdg)) {
                              ^
  /home/prisma/fuerte_workspace/stacks/knowrob/json_prolog/src/java/edu/tum/cs/ias/knowrob/json_prolog/PrologBindings.java:91: cannot find symbol
  symbol  : variable JSONObject
  location: class edu.tum.cs.ias.knowrob.json_prolog.PrologBindings
                        Term obj = JSONQuery.decodeJSONValue(JSONObject.fromObject(bdg));
                                                             ^
  /home/prisma/fuerte_workspace/stacks/knowrob/json_prolog/src/java/edu/tum/cs/ias/knowrob/json_prolog/PrologBindings.java:94: cannot find symbol
  symbol  : variable JSONUtils
  location: class edu.tum.cs.ias.knowrob.json_prolog.PrologBindings
                    } else if(JSONUtils.isString(bdg)) {
                              ^
  /home/prisma/fuerte_workspace/stacks/knowrob/json_prolog/src/java/edu/tum/cs/ias/knowrob/json_prolog/PrologBindings.java:97: cannot find symbol
  symbol  : variable JSONUtils
  location: class edu.tum.cs.ias.knowrob.json_prolog.PrologBindings
                    } else if(JSONUtils.isNumber(bdg)) {
                              ^

I'm using Ubuntu 12.04 and ros fuerte release.

Any suggestions??