difficulty uploading

I'm having difficulty uploading files despite previously being able to do so. The log is:


[17:14:16] SIZE p4.jpg
[17:14:16] 550 p4.jpg: No such file or directory
[17:14:16] File exist check failed. File not found or permission denied.
[17:14:16] PASV
[17:14:16] 227 Entering Passive Mode (62,253,162,29,232,18)
[17:14:16] Opening data connection to 62.253.162.29 Port: 59410
[17:14:16] STOR p4.jpg
[17:14:17] 550 p4.jpg: Permission denied
[17:14:17] Transfer failed.
[17:14:17] Operation End
[17:14:47] Operation Begin
[17:14:47] Remote file exist check: "p4.jpg".
[17:14:47] SIZE p4.jpg
[17:14:47] 550 p4.jpg: No such file or directory
[17:14:47] File exist check failed. File not found or permission denied.
[17:14:47] PASV
[17:14:47] 227 Entering Passive Mode
[17:14:47] Opening data connection to
[17:14:47] STOR p4.jpg
[17:14:47] 550 p4.jpg: Permission denied
[17:14:47] Transfer failed.
[17:14:47] Operation End

Any Suggestions

You have insufficient permissions to upload:
[17:14:47] 550 p4.jpg: Permission denied
[17:14:47] Transfer failed.

Please contact your web hosting provider.