Error in uploading image[screenshot included]

[kcm4web]

hi there
i got error when creating a thumbs. pls have a look at the screen shot . and pls help me to solve

[Jan]

Hi, this seems like some problem with overwriting thumbnails, try to remove all thumbnails which you want to recreate on the server

[kcm4web]

i deleted the existing thumbnails by ftp and successfully got a chance to upload the image again but it fails and same error showed. i dont know whats the problem? is there any trouble in server. it was working fine earlier.

[Jan]

Hmmm, maybe you should try to test permissions and ownership of files on your server.