Canon EF 28-90mm lens problem

[canonnite]

Not sure if i am in the right section of the forum, if I am not I am sorry. but i need some help with my camera. I have a brand new canon XS body and an older canon ef 28-90mm lens, every few pictures i take with it the camera will say error i need to clean the lens contacts, i have done so with a q tip and rubbing alcohol and let it dry, and it is still doing this when i put the lens back on the body and start to take some pics. any help? thanks

 

[Dao]

Maybe try to clean it with the eraser (the one you find on your pencil)

 

[canonnite]

i did. and its still popping up