i received that error several times and for me it was because i had negative scav karma, so i had to go the traders tab and put fence on max rep and then save before that error would go away
This solved it for me. Apparently the app bugs out when your scav rep is negative.
After having been able to successfully use the editor in the past I can now no longer save any changes. I get the following:
Exception Message: index was out of range. And the program quits. Attached the full error as a png.
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