Directory wp-content/gallery/ is not writeable !
Check this link, if you didn't know how to set the permission : http://codex.wordpress.org/Changing_File_Permissions
I'm installing WordPress and I've been doing it all manually cause of above error. Now I have a situation where I can't install manually.
So I have to face this problem.
I don't want to make the site writable for public, just me and logged on admins. Which CHMOD should I choose?