You’re running into the same known issue this thread is tracking. I took a look at the request ID you shared, and it’s failing the same way: it’s a problem on our side with retrieving some saved state for that chat, not anything wrong with your setup, cache, or network.
To answer your question directly: clearing a local cache or re-indexing won’t get around it. The error means that one chat is pointing at a piece of stored conversation state we can’t retrieve anymore, and there’s no client-side way to bring that back. That specific chat can’t be resumed.
The reliable workaround is to start a new chat. New chats don’t reference the missing data, so they should work normally. If you need to keep going with the same task, briefly re-summarize the key points into the fresh chat.
This is a known issue our team is actively working on. The fix hasn’t fully shipped yet, so I’d hold off on assuming a client update will resolve it. I’ll follow up here once it’s out. Sorry for the disruption in the meantime!