# CSV.jl fails precompling, TypeError: in Type{...} expression, expected UnionAll, got Type{Parsers.Options}

**URL:** <https://discourse.julialang.org/t/csv-jl-fails-precompling-typeerror-in-type-expression-expected-unionall-got-type-parsers-options/67195>\
**Category:** General Usage\
**Tags:** question, csv\
**Created:** [August 27, 2021, 9:32pm UTC](https://discourse.julialang.org/t/csv-jl-fails-precompling-typeerror-in-type-expression-expected-unionall-got-type-parsers-options/67195 "2021-08-27T21:32:13Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![erickn](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/erickn/32/27431_2.png) [@erickn](https://discourse.julialang.org/u/erickn)\
**Post date:** [August 30, 2021, 1:33am UTC](https://discourse.julialang.org/t/csv-jl-fails-precompling-typeerror-in-type-expression-expected-unionall-got-type-parsers-options/67195/4 "2021-08-30T01:33:54Z")

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Thank for the explanation. I kinda suspected what you mentioned from the line where the issue occurs and by looking through the master branch. But, I did not know IJulia can behave that way, so I ended up putting up this question. Good to know.

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_[View the full topic](https://discourse.julialang.org/t/csv-jl-fails-precompling-typeerror-in-type-expression-expected-unionall-got-type-parsers-options/67195)._