"Unable to load conversation" - error

Hi folks, I’m having trouble accessing my previous conversations on both web and the Android app. Whether it’s an old conversation or a recent one, I keep getting the error “unable to load conversation.” I’ve tried clearing the cache, which sometimes works, but most of the time it doesn’t. On the mobile app, I also get a “too many requests” message when trying to open chats. It’s been really frustrating. Has anyone else faced this or found a solution? Please note that even short conversations, like ones with just 2 messages, don’t open. I’ve also tried incognito mode, but still same issue. Could this be because I’m on the free plan? Do I need to upgrade to use it normally? Any help would be appreciated. Thanks!