filereference multiple files - 2044 error

OK, I'm making a system to upload photos to a gallery. I'm using filereference, and it's working alright. I can upload like 20 files fine sometimes.. but when I do like 50, it starts giving me errors on over half the files.

The error is: Error #2044: Unhandled IOErrorEvent:. text=Error #2038: File I/O Error.

This may be a php error, or server error, I'm not sure. Because the file isn't even uploading at all.

http://board.flashkit.com/board/showthread.php?t=742315

Tried the htaccess, didn't do anything. and it shouldn't be the filesize, since I was able to upload 2mb photos, the large batches, where I was having problems was with about 20+ photos around 300k each.

K well, I fixed it.. Instead of having a for() loop load each file together, I made a function to load each file and wait until it's finished to start loading the next.. seems to work.