Tutorial - RuneMate Spectre – Common Issues & Troubleshooting
RuneMate says you have reached your instance limit & you can't load another instance:
If the client is force-closed (or crashes), it can take the RuneMate servers up to 30 minutes to identify that the session has ended. Please wait up to 30 minutes and try again. If you still cannot run another instance, let us know. Supporters can run more instances than free users, see:
Upgrade | RuneMate
Unable to create advertising
This is an error at Jagex's end when using the official RuneScape client. This is nothing to do with RuneMate. There is a workaround available here:
Tutorial - Bypass "Unable to create advertising" error