I’m thinking “Not Helpful”

Indeed.

Comments

[Martijn]

Better than:
"Object reference not set to an instance of an object error"

[Seppe]

@Martijn How do you mean? That just means you forgot to initialize your object, so that errormessage is extremely helpful and clear if you know how objects work (which you are supposed to know if you're using them)...

Excel on the other hand is meant for "normal" users that don't necessarily know how the program works, and the message does't give a reason, it just says "something went wrong". Ergo: not really helpful...