Unhandled Exception: System.InvalidOperationException: Exception builder node not found in active workflow editor.

[liuquansong]

Hi,
I wrote a bonsai script which enables me to capture and trace an object in a specific region. When I press the space button, the program begins to trace the object and record its timestamp, center X, center Y, etc.
When the object is on the left, the digital output is high. When the object in on the right, the digital output is low. I call this a left trial. The right trial is vice versa, and the basement trial stays low digital output all the time.
The program will automatically run from basement trial to left trial and then right trial, with each trial running 10 minutes.

My problem is, only sometimes, when I hit the space button and begin to track, the program only runs well in the first a few minutes ( which is basement trial), but when it ends the basement trial and switch to left trial, Bonsai will crash with an error window (showed in the .zip file).

Since it occurs not very often, I wonder if it is because I switch trial with no delay. So I write some delay functions which delay 1 second after each trial ends. However, the same problem still occurs today and I have no idea why it occurs. (Crashed after the baseline trial).

I'll appreciate it if anyone can help.

BonsaiBug.zip

Thanks,
Haifan

[liuquansong]

My working environment is Bonsai 2.6.3, Windows 10 64-bit.