Help me plz

I'm making a program which should send a message to another computer over rednet, using rednet.send.
Here's my code

Can anyone tell me why it keeps saying "rednet 347: positive number expected" and how i can fix this? Thanks :P/>/>

Where you got

print("Receiver ID:")
rid = read()

You are taking a string for input, try this instead:

print("Receiver ID:")
rid = tonumber(read())

This will make sure that the input is a number (basically).
Because rednet.send() needs the first syntax to be a number.

change

rid = read()

to

rid = tonumber(read())

EDIT: Ninja'd :P/>/> Var iaf en svensk jag blev ninja'd av xD

Thanks guys :P/>/>