[Zachery]

http 413 is requested entity is too large. Whatever you're trying to upload is larger than php/server is capable of dealing with. You'd need to contact your webhost for additional help.

For future reference, the first number is the http error code, the last number is the flash error code. Though more often than not the http error code is far more helpful. The codes here were 413 requested entity too large, and the Input Output Error from flash. Saying it couldn't read or write the file (or a bit of both)