Error using asyncio.Me​ssageHandl​er/onError (line 31)

Hi all,

I wrote a software with a GUI in appdesigner to collect data from an instrument via a serial connection. Therefore I send a write-command to get the instrument data and a read-command to read in the data-line

My problem with my software is that I get the following errors (sorry for the German error codes) randomly:

(1) Error using asyncio.MessageHandler/onError (line 31)

(2) Der E/A-Vorgang wurde wegen eines Threadendes oder einer Anwendungsanforderung abgebrochen

(3) Error in waitforallfiguresclosed (line 14)

I found nothing on the internet showing me up a solution for that problem. So I hope you will help me. It's absolutely unclear for me what happens @ (1) and (2). Especially (2) is confusing me because I don't know what that should mean. Which Threadends or application requirement???

Hopefully you can help me.

Best, Christian