# Nested task error on Julia-1.12-rc1

**URL:** <https://discourse.julialang.org/t/nested-task-error-on-julia-1-12-rc1/131256>\
**Category:** General Usage\
**Tags:** question, multithreading\
**Created:** [July 31, 2025, 4:36pm UTC](https://discourse.julialang.org/t/nested-task-error-on-julia-1-12-rc1/131256 "2025-07-31T16:36:21Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![mbauman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbauman/32/31082_2.png) [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Post date:** [July 31, 2025, 4:40pm UTC](https://discourse.julialang.org/t/nested-task-error-on-julia-1-12-rc1/131256/2 "2025-07-31T16:40:46Z")

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> <https://github.com/ufechner7/FLORIDyn.jl/blob/f2175f31f6c2c78d53692b98ff9b6a9924df7ac8/src/visualisation/calc_flowfield.jl#L97-L99>

That’s your problem. [PSA: Thread-local state is no longer recommended; Common misconceptions about threadid() and nthreads()](https://discourse.julialang.org/t/psa-thread-local-state-is-no-longer-recommended-common-misconceptions-about-threadid-and-nthreads/101274)

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