Errors in databinding used to kill the form as you say without giving any information.
Then, for a short period, they used to show a beautiful traceback with a link that would open the form in design mode and set the focus to the offending databinding. If more than one databinding failed, there was one traceback per failed databinding.
Then the link stopped working.
Then the tracebacks stopped appearing.
I loved them and enjoyed them while they were working. I haven’t checked recently, but last time I had a databinding problem they were still broken.
Se here: [Beta] Clicking on link on traceback error from databinding doesn't work