### Error querying database.  Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'delegationStateString' of 'class org.activiti.engine.impl.persistence.entity.TaskEntityImpl' with value '' Cause: java.lang.IllegalArgumentException: No enum constant org.activiti.engine.task.DelegationState.
### The error may exist in org/activiti/db/mapping/entity/Task.xml
### The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.selectTaskByQueryCriteria
### The error occurred while handling results
### SQL: select distinct RES.*            from ACT_RU_TASK RES                                           left          join ACT_RU_IDENTITYLINK I_OR0 on I_OR0.TASK_ID_ = RES.ID_                                                                           WHERE          (  RES.OWNER_ = ?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         or (RES.ASSIGNEE_ = ?                   or (RES.ASSIGNEE_ is null                   and I_OR0.TYPE_ = 'candidate' and (I_OR0.USER_ID_ = ?                                      ))) )              order by RES.ID_ asc     LIMIT ? OFFSET ?
### Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'delegationStateString' of 'class org.activiti.engine.impl.persistence.entity.TaskEntityImpl' with value '' Cause: java.lang.IllegalArgumentException: No enum constant org.activiti.engine.task.DelegationState.