springboot 2.1.5activiti 7 使用taskCandidateUser报错

springboot 2.1.5 activiti 7
使用taskService.createTaskQuery().taskId(taskId).taskCandidateUser("admin").singleResult();报错

启动类去除security

activit7集成了spring-security,如果你没用到security最好降级使用activiti6,如果项目中已经用到了security参考配置https://github.com/Activiti/activiti-examples/blob/master/activiti-api-basic-task-example/src/main/java/org/activiti/examples/DemoApplicationConfiguration.java