# ModelingToolkit @named
**URL:** https://discourse.julialang.org/t/modelingtoolkit-named/82772
**Category:** General Usage
**Created:** [June 14, 2022, 5:40pm UTC](https://discourse.julialang.org/t/modelingtoolkit-named/82772 "2022-06-14T17:40:33Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@ccccc](https://discourse.julialang.org/u/ccccc)
#### Post date: [June 14, 2022, 5:40pm UTC](https://discourse.julialang.org/t/modelingtoolkit-named/82772/1 "2022-06-14T17:40:33Z")
I am following the modeling toolkit examples, I am copy/pasting from:
> **[GitHub - SciML/ModelingToolkit.jl: An acausal modeling framework for...](https://github.com/SciML/ModelingToolkit.jl)**
>
> An acausal modeling framework for automatically parallelized scientific machine learning (SciML) in Julia. A computer algebra system for integrated symbolics for physics-informed machine learning a...
[https://mtk.sciml.ai/stable/tutorials/ode\_modeling/](https://mtk.sciml.ai/stable/tutorials/ode_modeling/)
but @named is not working. Does anyone know why?
@named fol = ODESystem([D(x) ~ (1 - x)/τ])
LoadError: UndefVarError: @named not defined
in expression starting at In[5]:1
Stacktrace:
[1] top-level scope
@ :0
[2] eval
@ .\boot.jl:373 [inlined]
[3] include\_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
@ Base .\loading.jl:1196
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### Author:  [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)
#### Post date: [June 14, 2022, 5:48pm UTC](https://discourse.julialang.org/t/modelingtoolkit-named/82772/2 "2022-06-14T17:48:59Z")
What version of MTK are you using? Is it the latest version?
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### Author:  [@ccccc](https://discourse.julialang.org/u/ccccc)
#### Post date: [June 14, 2022, 8:36pm UTC](https://discourse.julialang.org/t/modelingtoolkit-named/82772/3 "2022-06-14T20:36:11Z")
I think so. If I add ModelingToolkit again or update it, it says no changes.
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### Author:  [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)
#### Post date: [June 15, 2022, 5:28am UTC](https://discourse.julialang.org/t/modelingtoolkit-named/82772/4 "2022-06-15T05:28:42Z")
That does not guarantee that you have the latest version, you might have another package installed that is holding MTK back from being updated
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### Author:  [@ccccc](https://discourse.julialang.org/u/ccccc)
#### Post date: [June 15, 2022, 9:09am UTC](https://discourse.julialang.org/t/modelingtoolkit-named/82772/5 "2022-06-15T09:09:15Z")
Thanks - I learned about project environments and deleted and reinstalled. Pretty sure at some point there was a package that needed it to be an earlier version…