Bulletin-attempt to call nil

oldPull = os.pullEvent
os.pullEvent = os.pullEventRaw
local bulletin = fs.open("bulletin","a")
local mon = peripheral.wrap("top") --peripheral.wrap("monitor")
mon.clear()
mon.setCursorPos(1,1)
mon.setTextScale(5)
mon.write("NEWS")
mon.setTextScale(3)
rednet.open("back")
while true do
ev, id, msg = os.pullEvent()
if ev == "rednet_message" then
bulletin.flush(id..")"..msg)
print(id..")"..msg)
mon.write(id..")"..msg)
elseif ev == "terminate" then
os.pullEvent = oldPull
bulletin.close()
shell.exit()
end
end

I get an attempt to call nil on the line

bulletin.flush(id..")"..msg)

And here's the sender code:

rednet.open("back")
while true do
rednet.broadcast(read())
end

Flush seems to be relatively new - CC 1.55, if I'm not mistaken. Which version are you using?

you forgot to specify what mode fs should open the file in.
http://computercraft.info/wiki/Fs.open

Bomb Bloke, on 31 December 2013 - 08:44 AM said:

Flush seems to be relatively new - CC 1.55, if I'm not mistaken. Which version are you using?

1.58.
writeLine doesn't work either.Same error.

I see you corrected the mistake i pointed out. When opening a file with append, the file must already exist. Use fs.exist(filepath) to make sure, or just check manually