ManagedDataModelException.noDestinationEntity(ManagedEntity entity, Symbol property)

Source

factory ManagedDataModelException.noDestinationEntity(
    ManagedEntity entity, Symbol property) {
  var typeMirror = entity.persistentType.instanceMembers[property].returnType;
  return new ManagedDataModelException(
      "Relationship '${_getName(property)}' on "
      "'${_getPersistentClassName(entity)}' expects that there is a subclass "
      "of 'ManagedObject' named '${_getName(typeMirror.simpleName)}', "
      "but there isn't one. If you have declared one - and you really checked "
      "hard for typos - make sure the file it is declared in is imported appropriately.");
}