# Differential Equations Solve - top not defined

**URL:** <https://discourse.julialang.org/t/differential-equations-solve-top-not-defined/44510>\
**Category:** General Usage\
**Tags:** question, package, diffeq\
**Created:** [August 7, 2020, 4:12pm UTC](https://discourse.julialang.org/t/differential-equations-solve-top-not-defined/44510 "2020-08-07T16:12:52Z")\
**Posts on this page:** 2\
**Page:** 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:** [November 17, 2020, 5:20am UTC](https://discourse.julialang.org/t/differential-equations-solve-top-not-defined/44510/21 "2020-11-17T05:20:47Z")

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That’s odd: looks like you have 0.18. What happens if you restart your Julia session? Maybe you never restarted after updating your packages?

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**Author:** ![ayaoyao214](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ayaoyao214/32/19370_2.png) [@ayaoyao214](https://discourse.julialang.org/u/ayaoyao214)\
**Post date:** [November 24, 2020, 2:57pm UTC](https://discourse.julialang.org/t/differential-equations-solve-top-not-defined/44510/22 "2020-11-24T14:57:24Z")

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Hi, thanks for replying! Yeah, I restart it and it fixed 😆 !

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