# Reverting back to avoid precompile errors?

**URL:** <https://discourse.julialang.org/t/reverting-back-to-avoid-precompile-errors/67354>\
**Category:** New to Julia\
**Tags:** question\
**Created:** [August 30, 2021, 1:48pm UTC](https://discourse.julialang.org/t/reverting-back-to-avoid-precompile-errors/67354 "2021-08-30T13:48:07Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Sukera](https://avatars.discourse-cdn.com/v4/letter/s/ce7236/32.png) [@Sukera](https://discourse.julialang.org/u/Sukera)\
**Post date:** [August 30, 2021, 1:52pm UTC](https://discourse.julialang.org/t/reverting-back-to-avoid-precompile-errors/67354/2 "2021-08-30T13:52:41Z")

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> [@CSV.jl fails precompling, TypeError: in Type{...} expression, expected UnionAll, got Type{Parsers.Options}](https://discourse.julialang.org/t/csv-jl-fails-precompling-typeerror-in-type-expression-expected-unionall-got-type-parsers-options/67195/3):
>
> This can usually be fixed by pinning Parsers.jl to v1.2.1 for the time being. A new CSV.jl release compatible with Parsers.jl 2.0 is coming soon, hopefully in the next week or so.

[https://pkgdocs.julialang.org/v1/managing-packages/#Pinning-a-package](https://pkgdocs.julialang.org/v1/managing-packages/#Pinning-a-package)

So e.g.

`]pin Parsers@v1.2.1`

should do the trick.

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