Uploading Plugins

I’m having trouble uploading a WP plugin via FTP. Here is the FTP log:

TYPE I
200 TYPE is now 8-bit binary
PASV
227 Entering Passive Mode (67,19,100,2,64,61)
STOR wp-scrobbler.php
553-Can’t open that file: Permission denied
553 Rename/move failure: No such file or directory
CWD /public_html/dev/wp-content/plugins/
250 OK. Current directory is /public_html/dev/wp-content/plugins
PWD
257 “/public_html/dev/wp-content/plugins” is your current location
TYPE A
200 TYPE is now ASCII
PASV
227 Entering Passive Mode (67,19,100,2,162,114)
LIST
150 Accepted data connection
226-Options: -a -l
226 5 matches total
Transfer done: 316 bytes in 1.047 secs (0.30 KB/s)

I tried to chmod to 777 but it wouldn’t let me do that, however I was able to rename the wp-content directory. Does anyone have any idea why this might be happening? Any help at all is greatly appreciated, thanks!