[erlang-questions] 1st day of Erlang: what is wrong with this code

[avinash D'silva]

loop(Socket) ->
case gen_tcp:recv(Socket, 0) of
{ok, Data} ->
gen_tcp:send(Socket, string:to_upper(Data)),
loop(Socket);
{error, closed} ->
ok
end.

I get an error for string:to_upper()

I am trying to create a simple echo server that converts text to upper case.

original code: http://20bits.com/article/network-programming-in-erlang/
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