# How to Build and Use a Parallel Function with Symbolics.build\_function in Julia

**URL:** <https://discourse.julialang.org/t/how-to-build-and-use-a-parallel-function-with-symbolics-build-function-in-julia/114895>\
**Category:** General Usage\
**Tags:** question, symbolics\
**Created:** [May 29, 2024, 6:38am UTC](https://discourse.julialang.org/t/how-to-build-and-use-a-parallel-function-with-symbolics-build-function-in-julia/114895 "2024-05-29T06:38:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Maysam\_Gholampour](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/maysam_gholampour/32/218184_2.png) [@Maysam\_Gholampour](https://discourse.julialang.org/u/Maysam_Gholampour)\
**Post date:** [May 29, 2024, 6:38am UTC](https://discourse.julialang.org/t/how-to-build-and-use-a-parallel-function-with-symbolics-build-function-in-julia/114895/1 "2024-05-29T06:38:02Z")

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Dear all,

I have built a function in the same fashion as described in the Getting Started section of the Symbolics.jl documentation ([Getting Started with Symbolics.jl · Symbolics.jl](https://docs.sciml.ai/Symbolics/stable/getting_started/#Building-Functions)). The only thing I changed was adding `parallel = Symbolics.MultithreadedForm()` in `build_function`. However, when I include the written function and then try to apply the evaluated function, I receive an error regarding `Symbolics.var"#noop#398"`.

Thanks in advance,

@ChrisRackauckas

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [May 29, 2024, 7:03am UTC](https://discourse.julialang.org/t/how-to-build-and-use-a-parallel-function-with-symbolics-build-function-in-julia/114895/2 "2024-05-29T07:03:45Z")

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Open an issue. @shashi did you disable this?