AS:GenerateSerial error is considered a "server error"

AS:GenerateSerial exception should be converted to a “user” exception so “Server error occurred” does not show up. The message is also repeated 3x.


This error should result in and only in the following sentence:

Pro datum 31.12.2021 0:00:00 nebyla nalezena platná číselná řada.
Kód číselné řady: 'SBICN'.