No valid 'elements' option was specified for xxx

@JsonObject({ knownTypes: [EinheitentabellenEintrag, NachschlagetabellenEintrag]})
export class Nachschlagetabelle {
    public static get NACHSCHLAGETABELLE_TYPE(): string {
        return "Nachschlagetabelle";
    }

    @JsonMember
    tabellenname: string = "";

    @JsonMember({ elements: EinheitentabellenEintrag})
    test: EinheitentabellenEintrag[];

    @JsonMember({ elementType: NachschlagetabellenEintrag })
    ntEintraege: NachschlagetabellenEintrag[] = [];
}

Error: No valid ‘elements’ option was specified for ‘Nachschlagetabelle.test’.(…)

Why do I get the error message eventhough I specified the elements option?

[JohnWeisz]

Also see https://github.com/Microsoft/TypeScript/issues/13174

[Rookian]

@JohnWhiteTB It would be nice, if you could mention this limitation on the documentation. In addition I noticed that you must specifiy the member type. So the following class would not work properly:

export class Test {
  id = 1;
}