getSessionID not optional?

debug_output.txt

DEBUG: setting up form upload parsing ...
DEBUG: received message: { type: 'warning',
  isupload: true,
  msg: 'unable to retrieve session identifier, configuration parameter me.getSessionID must be a function!' }

/Volumes/code/git/fileservice/node_modules/formaline/lib/formaline.js:478
a( me.firstChunk, me.sendResponseToMultipart.bind( me, me.firstChunk.length ) 
                                                                    ^
TypeError: Cannot read property 'length' of null
    at /Volumes/code/git/fileservice/node_modules/formaline/lib/formaline.js:478:113
    at /Volumes/code/git/fileservice/node_modules/formaline/lib/formaline.js:349:72

express_app_partial.js

sys.debug('setting up form upload parsing ...');
      var form_config = {
        uploadRootDir : settings.uploadDir(),
        holdFilesExtensions : true,
        listeners:{
          'message':function(json){
            sys.debug('received message: '+util.inspect(json));
          },
          'error':function(json){
            sys.debug('error type '+json.type+' with message '+json.msg);
            if(json.isfatal)
            {
              res.send({status:"error",data:json.msg}, {'Content-Type':'application/json'}, 500);
            }
          },
          'abort':function(json){
            json.debug('upload aborted; '+json.msg);
            if(json.isfatal)
            {
              res.send({status:"error",data:'upload aborted; '+json.msg}, {'Content-Type':'application/json'}, 500);
            }
          },
          'loadend':function(json, res, next){
            if(json.files){
              switch(json.files.length){
                case 0:
                  res.send({status:"error",data:"No files found in request."}, {'Content-Type':'application/json'}, 400);
                  break;
                case 1:
                  jsend(json.files[0].value[0].path, res);
                  break;
                default:
                  res.send({status:"error",data:"Whoah! You uploaded multiple files! Settle down, hopscotch."}, {'Content-Type':'application/json'}, 400);
              }
            }
            next();
          }
        }
      };
      form = new formaline(form_config);
      form.parse(req, res, function(){
        sys.debug('\'next\' function called ...');
      });