Not to the user, but to the program, it can be expecting some errors as natural outcomes of a certain call, while not expecting others. “Unexpected error” basi

Not to the user, but to the program, it can be expecting some errors as natural outcomes of a certain call, while not expecting others. “Unexpected error” basically means “I called a function that threw an exception, but didn’t have code in place to catch it, so it hit some toplevel global exception handler that just aborts the whole thing.”