Exception

A Standard_ConstructionError exception can be raised by any of a large number of OCC functions. I would start by wrapping the suspect code (or "main" if you can't narrow it down) with a catch block and printing the message string for the exception (see below). If this doesn't give enough information, you need to start wrapping blocks of OCC code to narrow down the source.

catch (Standard_Failure( {
Handle(Standard_Failure) error = Failure::Caught();
cerr << error << endl;
}