how to direct import bpmn file into activiti without converting iit from demo.bpmn.io

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Member II

how to direct import bpmn file into activiti without converting iit from demo.bpmn.io

Hi, I am working on activiti and trying to import bpmn file direct to activiti but its throwing error of

 ERROR org.activiti.app.rest.editor.AbstractModelsResource  - Import failed

nullpointerexception 

and on UI its showing error as 

Error while processing the BPMN XML file : Import failed for test.bpmn, error message null

can any one help one this..