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Editorial Team
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Asked: 2026-05-23T14:59:08+00:00

I can’t understand why this doesn’t work: -module(hello). -export([hello_world/0]). hello_world() -> io:fwrite(hello, world\n). (hello_world@PC)8>

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I can’t understand why this doesn’t work:

    -module(hello).
    -export([hello_world/0]).

    hello_world() -> io:fwrite("hello, world\n").

(hello_world@PC)8> hello:hello_world().
** exception error: undefined function hello:hello_world/0
(hello_world@PC)9>
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1 Answer

  1. Editorial Team

    Have you compiled your source code? Type c(hello). in Eshell (assuming that hello.erl is the name of the source file) before calling the function.

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