[jbpm-5.4, eclipse] simple work item - ioSpecification is not complete error

[sv13]

hi, i am trying to do simple work item from here: http://docs.jboss.org/jbpm/v5.4/userguide/ch.domain-specific-processes.html#d0e7389

my code:

.wid file

import org.drools.process.core.datatype.impl.type.StringDataType;
[
  // the Notification work item
  [
    "name" : "Notification",
    "parameters" : [
      "Message" : new StringDataType(),
      "From" : new StringDataType(),
      "To" : new StringDataType(),
      "Priority" : new StringDataType(),
    ],
    "displayName" : "Notification",
    "icon" : "icons/notification.gif"
  ]
]

then i implemented and registered work item handler with simple

@Override
public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
    String from = (String) workItem.getParameter("From");
    System.out.println("from " + from);
}

my custom node automatically appeared in eclipse modeler, so i made simple process:

start > node > end

and set value of 'From' parameter, but when executing it i get:

ERROR ExtensibleXmlParser:666 - (null: 24, 31): cvc-complex-type.2.4.b: The content of element 'bpmn2:ioSpecification' is not complete. One of '{"http://www.omg.org/spec/BPMN/20100524/MODEL":inputSet, "http://www.omg.org/spec/BPMN/20100524/MODEL":outputSet}' is expected.

also 'from null' is printed

my bpmn file contains only one ioSpecification, and it have inputSet node

<bpmn2:ioSpecification id="_InputOutputSpecification_12">
    <bpmn2:dataInput id="_DataInput_15" name="Message"/>
    <bpmn2:dataInput id="_DataInput_16" itemSubjectRef="ItemDefinition_4" name="From"/>
    <bpmn2:dataInput id="_DataInput_17" name="To"/>
    <bpmn2:dataInput id="_DataInput_18" name="Priority"/>
    <bpmn2:inputSet id="_InputSet_12" name="Input Set 12">
      <bpmn2:dataInputRefs>_DataInput_15</bpmn2:dataInputRefs>
      <bpmn2:dataInputRefs>_DataInput_16</bpmn2:dataInputRefs>
      <bpmn2:dataInputRefs>_DataInput_17</bpmn2:dataInputRefs>
      <bpmn2:dataInputRefs>_DataInput_18</bpmn2:dataInputRefs>
    </bpmn2:inputSet>
  </bpmn2:ioSpecification>

i am using jbpm 5.4.final

eclipse BPMN2 Editor 0.2.5.201305082126

eclipse JBoss jBPM5 Runtime Extension Feature 0.2.5.201305082126

eclipse JBoss jBPM Core 5.5.0.Final

eclipse JBoss jBPM Task 5.5.0.Final