# ERROR: UndefVarError: AbstractEnsembleSolution not defined

**URL:** <https://discourse.julialang.org/t/error-undefvarerror-abstractensemblesolution-not-defined/29283>\
**Category:** General Usage\
**Tags:** question\
**Created:** [September 29, 2019, 3:18am UTC](https://discourse.julialang.org/t/error-undefvarerror-abstractensemblesolution-not-defined/29283 "2019-09-29T03:18:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [September 29, 2019, 4:48am UTC](https://discourse.julialang.org/t/error-undefvarerror-abstractensemblesolution-not-defined/29283/2 "2019-09-29T04:48:27Z")

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Your issue is that you are on a very old version of DiffEqBase.jl. Could you try `]up` to update your packages?

Note: this is probably the reason for [Unable to precompile ParameterizedFunctions](https://discourse.julialang.org/t/unable-to-precompile-parameterizedfunctions/29284) as well.

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