I have tried to view a bpmn2 file usint the bpmn-js online (https://demo.bpmn.io/) but when I open the file with extension “.bpmn2” it is not prorely viewed and the warning indiated is "the following:
Import Warnings --> One or more problems have been identified when trying to import the BPMN 2.0 diagram:
no bpmnElement referenced in <bpmndi:BPMNShape id="_5U4rLD6mEeqSi4IFJVh2TQ" />
This may have been caused by malformed input data. As a result the diagram may not render correctly.
See the wrong diagram in the below image:
Please, how can I view properly a file with “.bpmn2” extension?