activiti7报错：org.activiti.bpmn.exceptions.XMLException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'process'.

解决方法：https://blog.csdn.net/yang_zzu/article/details/103998671
org.activiti.bpmn.exceptions.XMLException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'process'. One of '{"http://www.omg.org/spec/BPMN/20100524/MODEL":import, "http://www.omg.org/spec/BPMN/20100524/MODEL":extension, "http://www.omg.org/spec/BPMN/20100524/MODEL":rootElement, "http://www.omg.org/spec/BPMN/20100524/DI":BPMNDiagram, "http://www.omg.org/spec/BPMN/20100524/MODEL":relationship}' is expected.
at org.activiti.bpmn.converter.BpmnXMLConverter.convertToBpmnModel(BpmnXMLConverter.java:279) ~[activiti-bpmn-converter-7.1.0.M6.jar:na]
at org.activiti.engine.impl.bpmn.parser.BpmnParse.execute(BpmnParse.java:148) ~[activiti-engine-7.1.0.M6.jar:na]
at org.activiti.engine.impl.bpmn.deployer.ParsedDeploymentBuilder.createBpmnParseFromResource(ParsedDeploymentBuilder.java:96) ~[activiti-engine-7.1.0.M6.jar:na]