Can’t Upload 2 Different Plugins

I read through other threads and didn’t see the error message that I’m receiving when I try to install the Caffeinated Content and Uniquefier Plugins. The message I get reads as follows:

“Unable to create directory /home/daydetox/public_html/detoxdrink/wp-content/uploads/2009/06. Is its parent directory writable by the server?”

I have WP 2.8 installed. Not sure what this means, but I need these plugins and am stalled until I can upload them. Thanks in advance for any ideas :}