500, 550, and 553 upload errors.

Hi there. I'm new to this entire process, so I'm sorry if this is a dumb question, but I looked through the tutorials and searched the forums to no avail thusfar. I'm just trying to load a picture onto the webspace allotted to me, but I'm getting 500, 550, and 553 errors. Any help would be greatly appreciated.

[22:17:03] SmartFTP v2.0.996.25
[22:17:04] Resolving host name "users.myacc.net"
[22:17:04] Connecting to 24.233.167.168 Port: 21
[22:17:06] Connected to users.myacc.net.
[22:17:06] 220 "Authorized FTP access only"
[22:17:06] USER zuckers1
[22:17:06] 331 Please specify the password.
[22:17:06] PASS (hidden)
[22:17:06] 230 Login successful. Have fun.
[22:17:06] SYST
[22:17:06] 215 UNIX Type: L8
[22:17:06] FEAT
[22:17:06] 500 Unknown command.
[22:17:06] TYPE I
[22:17:06] 200 Switching to Binary mode.
[22:17:06] REST 0
[22:17:06] 350 Restart position accepted (0).
[22:17:06] PWD
[22:17:06] 257 "/"
[22:17:06] CWD /public_html
[22:17:06] 250 Directory successfully changed.
[22:17:06] PWD
[22:17:06] 257 "/public_html"
[22:17:06] TYPE A
[22:17:06] 200 Switching to ASCII mode.
[22:17:06] PASV
[22:17:06] 227 Entering Passive Mode (24,233,167,168,40,204)
[22:17:06] Opening data connection to 24.233.167.168 Port: 10444
[22:17:06] LIST -aL
[22:17:06] 150 Here comes the directory listing.
[22:17:06] 226 Directory send OK.
[22:17:06] 119 bytes transferred. (3.74 KB/s) (31 ms)
[22:17:35] Remote file exist check: "zylcopy.jpg".
[22:17:35] TYPE I
[22:17:35] 200 Switching to Binary mode.
[22:17:35] SIZE zylcopy.jpg
[22:17:35] 550 Could not get file size.
[22:17:35] File size check (SIZE) failed. File not found or permission denied.
[22:17:35] PASV
[22:17:36] 227 Entering Passive Mode (24,233,167,168,247,132)
[22:17:36] Opening data connection to 24.233.167.168 Port: 63364
[22:17:36] STOR zylcopy.jpg
[22:17:36] 553 Could not create file.
[22:17:36] MDTM 20050902004112 zylcopy.jpg
[22:17:36] 550 Could not get file modification time.
[22:17:36] Transfer failed.
[22:17:36] TYPE A
[22:17:36] 200 Switching to ASCII mode.
[22:17:36] PASV
[22:17:36] 227 Entering Passive Mode (24,233,167,168,31,68)
[22:17:36] Opening data connection to 24.233.167.168 Port: 8004
[22:17:36] LIST -aL
[22:17:36] 150 Here comes the directory listing.
[22:17:36] 226 Directory send OK.
[22:17:36] 119 bytes transferred. (1.47 KB/s) (79 ms)