My MapCppGlobalRawTracks class uses the new global recon data structure to store Tracks under GlobalEvent. Upon attempting to write a ROOT file using the standard outputer I get the following error:

Traceback (most recent call last):
File "/home/lane/Development/maus/devel/src/common_py/ErrorHandler.py", line 162, in HandleCppException
raise CppError(error_message)
ErrorHandler.CppError: In branch recon_events
In branch global_event
In branch tracks
In branch detector_points
Failed to convert json value "0
// {"path":"#recon_events/0/global_event/tracks/2/detector_points"}

" to unsigned int at UIntProcessor::JsonToCpp

NOTE: I modified the UIntProcessor error message to show the actual json value it choked on:

unsigned int* UIntProcessor::JsonToCpp(const Json::Value& json_uint) {
  if (json_uint.isUInt()) {
      return new unsigned int (json_uint.asUInt());
  } else if (json_uint.isInt() && json_uint.asInt() > 0) {
      return new unsigned int (json_uint.asUInt());
  } else {
      std::stringstream message;
      message << "Failed to convert json value \"" << json_uint << "\"" 
              << " to unsigned int";
      throw(Squeal(
          Squeal::recoverable,
          message.str(),
          "UIntProcessor::JsonToCpp" 
      ));
  }
}

The easiest way to reproduce this is to modify simulate_mice.py to simply read in a JSON document and write out a root file (attached load_json.py), and create a configuration file (attached load_json_config.py) which reads in the attached bad.json file.