Video preview full screen on collection change

[LucaHsign]

hi, i made a software that changes the current collection. i use obs preview to reproduce video but when i change collection the preview is closed and i have to manually reopen it.
I tried with the "OpenProjector" command but doesnt work.
I always get the error "OBSWebSocketError: Your request type is not valid."

this is my code for nodejs api

exports.setSceneCollection = async (req, res) => {
  let obsData = await Obs.findOne({});
  try {
    await obs.connect(`ws://${obsData.ip}:4444`);
    await obs.call('SetCurrentSceneCollection', {
      'sceneCollectionName': req.body.name,
    });
    const sceneList = await obs.call('GetSceneList');
    const collectionList = await obs.call('GetSceneCollectionList');
    await obs.call(
      "OpenProjector", {
      type: "Preview",
      monitor: 0
    });
    await obs.disconnect();
    res.send({ status: 'ok', data: { ...collectionList, ...sceneList }, message: txt.success.operationDone });
  } catch (e) {
    console.log(e);
    throw new Error(txt.fail.connectionObs);
  }
};