# Getting a strange error when trying to join list of DataFrames, what could this be?

**URL:** <https://discourse.julialang.org/t/getting-a-strange-error-when-trying-to-join-list-of-dataframes-what-could-this-be/40997>\
**Category:** General Usage\
**Created:** [June 8, 2020, 2:30pm UTC](https://discourse.julialang.org/t/getting-a-strange-error-when-trying-to-join-list-of-dataframes-what-could-this-be/40997 "2020-06-08T14:30:51Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![josephmarturano](https://avatars.discourse-cdn.com/v4/letter/j/3d9bf3/32.png) [@josephmarturano](https://discourse.julialang.org/u/josephmarturano)\
**Post date:** [June 8, 2020, 2:45pm UTC](https://discourse.julialang.org/t/getting-a-strange-error-when-trying-to-join-list-of-dataframes-what-could-this-be/40997/2 "2020-06-08T14:45:37Z")

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The most recent update to DataFrames.jl changed the join API. Did you upgrade DataFrames.jl to 0.21?

If so, [this page](https://juliadata.github.io/DataFrames.jl/v0.21/man/joins/) shows the new joining functions.

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_[View the full topic](https://discourse.julialang.org/t/getting-a-strange-error-when-trying-to-join-list-of-dataframes-what-could-this-be/40997)._