# \[Solved\]Unbound module Rpc\_parallel

**URL:** <https://discuss.ocaml.org/t/solved-unbound-module-rpc-parallel/1341>\
**Category:** Ecosystem\
**Tags:** core, jbuilder\
**Created:** [December 26, 2017, 10:56am UTC](https://discuss.ocaml.org/t/solved-unbound-module-rpc-parallel/1341 "2017-12-26T10:56:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Taki](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/taki/32/718_2.png) [@Taki](https://discuss.ocaml.org/u/Taki)\
**Post date:** [December 26, 2017, 10:56am UTC](https://discuss.ocaml.org/t/solved-unbound-module-rpc-parallel/1341/1 "2017-12-26T10:56:40Z")

</div>

I tried to compile the [simple.ml](https://github.com/janestreet/rpc_parallel/blob/master/example/simple.ml) example of [rpc\_parallel](https://github.com/janestreet/rpc_parallel) by:

```auto
$ jbuilder build simple.exe
...
File "simple.ml", line 13, characters 54-77:
Error: Unbound module Rpc_parallel

```

I’d installed `Rpc_parallel` before

```auto
$ opam show --field=version rpc_parallel
v0.9.0

```

Is there anything else I missed?

---

<div class="post-metadata">

**Author:** ![lindig](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/lindig/32/532_2.png) [@lindig](https://discuss.ocaml.org/u/lindig)\
**Post date:** [December 26, 2017, 11:14am UTC](https://discuss.ocaml.org/t/solved-unbound-module-rpc-parallel/1341/2 "2017-12-26T11:14:35Z")

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What does your jbuild file look like?

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<div class="post-metadata">

**Author:** ![liweijian](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/liweijian/32/960_2.png) [@liweijian](https://discuss.ocaml.org/u/liweijian)\
**Post date:** [December 26, 2017, 11:43am UTC](https://discuss.ocaml.org/t/solved-unbound-module-rpc-parallel/1341/4 "2017-12-26T11:43:42Z")

</div>

I got the same issue on my macOS laptop