# TopNode not defined when trying to use ParallelAccelerator

**URL:** <https://discourse.julialang.org/t/topnode-not-defined-when-trying-to-use-parallelaccelerator/5714>\
**Category:** Julia at Scale\
**Tags:** bug, parallel\
**Created:** [September 4, 2017, 2:18pm UTC](https://discourse.julialang.org/t/topnode-not-defined-when-trying-to-use-parallelaccelerator/5714 "2017-09-04T14:18:48Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Naelson\_douglas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/naelson_douglas/32/1790_2.png) [@Naelson\_douglas](https://discourse.julialang.org/u/Naelson_douglas)\
**Post date:** [September 4, 2017, 2:18pm UTC](https://discourse.julialang.org/t/topnode-not-defined-when-trying-to-use-parallelaccelerator/5714/1 "2017-09-04T14:18:48Z")

</div>

Hello!

I’m trying to use ParallelAccelerator(which depends on CompilerTools.jl) on top of Julia 5.2 as in the screenshot attached.

 ![top node error](https://global.discourse-cdn.com/julialang/original/3X/3/c/3c8a5c0dae3112936e65a1aec9df58941a1753dc.png)

But I’m getting the “TopNode not defined error”. I see this error was fixed on version 5.2 in[this merge](https://github.com/JuliaLang/julia/commit/817d6c2a12ce29c2cac7b5d2abd42ba5baae7751)  
I’m running the v0.5.2 (bugfixes only) version which is found [here](https://julialang.org/downloads/oldreleases.html)  
(notices that this build was compiled in 17-05-06 and the Merge is from May 2016)

The packages version informations are all in the screenshot.

Why is it still not working?  
Thanks.