# Problem solving DDE: "no method matching \_initialize\_dae!"

**URL:** <https://discourse.julialang.org/t/problem-solving-dde-no-method-matching-initialize-dae/133049>\
**Category:** Modelling & Simulations\
**Created:** [October 10, 2025, 10:22am UTC](https://discourse.julialang.org/t/problem-solving-dde-no-method-matching-initialize-dae/133049 "2025-10-10T10:22:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tangjuan](https://avatars.discourse-cdn.com/v4/letter/t/b2d939/32.png) [@Tangjuan](https://discourse.julialang.org/u/Tangjuan)\
**Post date:** [October 10, 2025, 10:22am UTC](https://discourse.julialang.org/t/problem-solving-dde-no-method-matching-initialize-dae/133049/1 "2025-10-10T10:22:05Z")

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I am trying to solve a `DDEProblem` in Julia, but I encounter the error `no method matching _initialize_dae!`. Could anyone explain why this happens and how to fix it?

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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:** [October 10, 2025, 2:14pm UTC](https://discourse.julialang.org/t/problem-solving-dde-no-method-matching-initialize-dae/133049/2 "2025-10-10T14:14:00Z")

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Update your packages, we had a bad patch release yesterday and hotfixed it shortly after.

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**Author:** ![Tangjuan](https://avatars.discourse-cdn.com/v4/letter/t/b2d939/32.png) [@Tangjuan](https://discourse.julialang.org/u/Tangjuan)\
**Post date:** [October 11, 2025, 3:32am UTC](https://discourse.julialang.org/t/problem-solving-dde-no-method-matching-initialize-dae/133049/3 "2025-10-11T03:32:53Z")

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Thanks!!!