Transfer failed

i am receiving the following string when i try to upload a file:

[09:11:52] Remote file exist check: "ContactUs.aspx".
[09:11:52] TYPE I
[09:11:52] 200 Type set to I.
[09:11:52] SIZE ContactUs.aspx
[09:11:52] 550 ContactUs.aspx: The system cannot find the file specified.
[09:11:52] File size check (SIZE) failed. File not found or permission denied.
[09:11:52] PASV
[09:11:52] 227 Entering Passive Mode (199,231,149,244,9,95).
[09:11:52] Opening data connection to 199.231.149.244 Port: 2399
[09:11:52] STOR ContactUs.aspx
[09:11:52] 125 Data connection already open; Transfer starting.
[09:11:52] 2324 bytes transferred. (29.0 KB/s) (78 ms)
[09:11:52] 426 Connection closed; transfer aborted.
[09:11:52] MDTM 20061206135923 ContactUs.aspx
[09:11:52] 550 20061206135923 ContactUs.aspx: The system cannot find the file specified.
[09:11:52] TYPE A
[09:11:53] 200 Type set to A.
[09:11:53] PASV
[09:11:53] 227 Entering Passive Mode (199,231,149,244,9,96).
[09:11:53] Opening data connection to 199.231.149.244 Port: 2400
[09:11:53] LIST -aL
[09:11:53] 125 Data connection already open; Transfer starting.
[09:11:53] 226 Transfer complete.
[09:11:53] 13357 bytes transferred. (43.9 KB/s) (297 ms)
[09:11:53] Transfer failed.

the file i'm trying to upload is a 3k file located in my c drive, but the one that keeps appearing in my web directory is just an empty file with the same name as the one i'm trying to transfer. I've been using SmartFTP for a couple of weeks now and this is the first time I've had this problem. I'm usually able to upload from this same local file to this same web directory file with no issue.

any help would be appreciated.