# MTK error messages, change of use?

**URL:** <https://discourse.julialang.org/t/mtk-error-messages-change-of-use/117931>\
**Category:** Modelling & Simulations\
**Tags:** question\
**Created:** [August 7, 2024, 9:56pm UTC](https://discourse.julialang.org/t/mtk-error-messages-change-of-use/117931 "2024-08-07T21:56:18Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![LaraSchmalenstroer](https://avatars.discourse-cdn.com/v4/letter/l/ccd318/32.png) [@LaraSchmalenstroer](https://discourse.julialang.org/u/LaraSchmalenstroer)\
**Post date:** [August 8, 2024, 4:09pm UTC](https://discourse.julialang.org/t/mtk-error-messages-change-of-use/117931/3 "2024-08-08T16:09:57Z")

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I’m using `ModelingToolkit` v9.30.1:

```julia
[c3fe647b] AbstractAlgebra v0.42.0
[0f109fa4] BifurcationKit v0.3.6
[0c46a032] DifferentialEquations v7.13.0
[23fbe1c1] Latexify v0.16.4
[961ee093] ModelingToolkit v9.30.1
[8913a72c] NonlinearSolve v3.13.1
[91a5bcdd] Plots v1.40.5
[f27b6e38] Polynomials v4.0.11
[438e738f] PyCall v1.96.4
[9672c7b4] SteadyStateDiffEq v2.3.0
[24249f21] SymPy v2.1.1
[0c5d862f] Symbolics v5.35.1

```

Like I said in the original post, I’ve been using an older version before (v8.36.0) because of the requirements in `FindSteadyStates.jl` but updated to the latest version after seeing [this post](https://discourse.julialang.org/t/error-with-modelingtoolkit-documentation-example/113946) where an update solved the problem that `t_nounits` and `D_nounits` couldn’t be imported. In my case, the update didn’t solve the problems.

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_[View the full topic](https://discourse.julialang.org/t/mtk-error-messages-change-of-use/117931)._