com.microsoft.tfs.core.clients.workitem.exceptions
Classes 
QueryHierarchyException.Type
ValidationException.Type
WorkItemLinkValidationException.Type
Exceptions 
DeniedOrNotExistException
DuplicateBatchReadParameterException
FieldDefinitionNotExistException
ItemAlreadyUpdatedOnServerException
QueryHierarchyException
UnableToSaveException
UnauthorizedAccessException
ValidationException
WorkItemException
WorkItemLinkValidationException