rednet:6: string expected

Hi :)/>
I'm writing a program to control the number of bookshelves within range of an enchanting bench.
I have two computers, one to control the pistons and one to interface with the user. I managed to get the interface to work, but i can't get the second program to work.

Here is the pastebin link http://pastebin.com/UnPFVgDd

it just returns the error :

rednet:6: string expected

Any help?

Cheers, Neon

rednet.open()

The issue is on this line. You need to specify the side the modem is on as a string (hence "string expected").

e.g:

rednet.open("right")

in addition to Lignum's response, you spelled receive wrong on line 3. (i before e except after c)

also, why make input a variable and not just use message?
lines 16-22 should be indented once more. (just for looks and clean looking code)
finally it's good practice to use

local var = 0
-- instead of
var = 0

Ok, thankyou very much :)/>