Getting ChromeCast session_error when trying to create a queue

I'm trying to resume a video on a cast device and need to set the startTime of one item.

I figured out that you need to set startTime on a queueItem and not the mediaInfo. loading a mediaInfo works fine but loading a queueList dose not, it throws a session_error and I don't know why.

"A session could not be created, or a session was invalid."

const context = cast.framework.CastContext.getInstance();
const {SESSION_STATE_CHANGED} = cast.framework.CastContextEventType

// initiate session
cast.framework.CastContext.getInstance().requestSession()

context.addEventListener(SESSION_STATE_CHANGED, () => {
  switch (event.sessionState) {
    case cast.framework.SessionState.SESSION_STARTED:
      const castSession = cast.framework.CastContext.getInstance().getCurrentSession()
      const queueItem = new chrome.cast.media.QueueItem(createMediaInfo(source));
      queueItem.startTime = 50
      const itemsToAdd = [queueItem]
      const request = new chrome.cast.media.QueueLoadRequest(itemsToAdd);

      castSession.loadMedia(request).then(console.log, console.error)
      // Throws session_error --------^

    break
    case cast.framework.SessionState.SESSION_RESUMED:
      // update ui 
    break
    case cast.framework.SessionState.SESSION_ENDED:
      // update ui 
    break
  }
})

using the LoadRequest works fine but I can't set a startTime or set up a playlist with that.

const mediaInfo = createMediaInfo(source)
const request = new chrome.cast.media.LoadRequest(mediaInfo);
castSession.loadMedia(request).then(console.log, console.error)

from Getting ChromeCast session_error when trying to create a queue