Error Message useless

[Jarrett Billingsley]

"Tower Ty" <tytower at hotmail.com.au> wrote in message 
news:g02qih$16tn$1 at digitalmars.com...
> tango.core.Exception.IllegalArgumentException: Argument not valid
>
> This message from the compiler is just bloody useless
> Where do you go in a 200 line program?
>
> All I can see is go to each line that might be a cause and comment it out 
> ,try to compile it again and if no good do the next one .
>
> Some lines just can't be done anyway .
>
> How hard could it be for you experts to add some detail to the error huh 
> ??

Is this a *compiler* error?  Are you *sure*?

Do you get the error when you compile the program or when you run it?