Some errors are caused by things that do not need to be communicated to end users. Each error has an error code, however, which allows us to look up the problem at the code level more specifically. Sometimes errors also log more details to the system logs.
Where are you seeing "You have an error"? What is the error code, and if you view the system logs in the AdminCP (use the live search to look for "System Logs") do you see any related logs?