I would like to know what "Invalid Stream Header : 61646F62" means? It happens when I run my program.

Thanks. :)

You are trying to read from some kind of input stream, but the data is in the wrong format. This can happen if the format for reading doesn't match the format in which it was written, or the stream hasn't been closed properly, or you try to read the same stream with two consecutive different formats, or (less likely) the stream is corrupted by a problem external to your code.

"... the stream is corrupted by a problem external to your code."
What does this mean? Like virus and stuffs? :/

Okay, thank you for your help. :)