接入钉钉，发起审批实例失败

发起审批实实例的时候出现的错误，在附录也没有找到这个错误码。 {"errcode":820001,"errmsg":"发起审批实例失败，错误原因为【系统错误:Could not convert xml to bpmnModel.】

这个审批模板是用代码创建的，而不是直接在钉钉。出现这个错误是因为用代码创建的模板不能用来发起审批吗？求解答

代码是这样的：

DingUtils dingUtils = new DingUtils(); DefaultDingTalkClient client = new DefaultDingTalkClient("https://oapi.dingtalk.com/topapi/processinstance/create"); OapiProcessinstanceCreateRequest request = new OapiProcessinstanceCreateRequest(); request.setAgentId(574921606L);

    // 审批流表单参数，设置各表单项值
    List<OapiProcessinstanceCreateRequest.FormComponentValueVo> formComponentValues = new ArrayList<>();
	OapiProcessinstanceCreateRequest.FormComponentValueVo vo3 = new OapiProcessinstanceCreateRequest.FormComponentValueVo();
	vo3.setName("模具代码");
	vo3.setValue("10210001");
	formComponentValues.add(vo3);
    request.setFormComponentValues(formComponentValues);
    //设置审批人id
    request.setApprovers("K008276");
    //设置发起人id
    request.setOriginatorUserId("K008276");
    //设置发起人部门ID
    request.setDeptId(86675244L);
    //审批流唯一码
    request.setProcessCode("PROC-441D99A8-2604-402D-9229-CB2CC89C3D2D");
    
    client = new DefaultDingTalkClient("https://oapi.dingtalk.com/topapi/processinstance/create");

    OapiProcessinstanceCreateResponse response=null;
	try {
		response = client.execute(request, dingUtils.getAccess_token());
		return Result.success(response.getBody());
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
		return Result.failure(e+"");
	}