# KeyError: key Float64 not found

**URL:** https://discourse.julialang.org/t/keyerror-key-float64-not-found/50764
**Category:** New to Julia
**Tags:** question
**Created:** [November 25, 2020, 4:49pm UTC](https://discourse.julialang.org/t/keyerror-key-float64-not-found/50764 "2020-11-25T16:49:26Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![ZiqinHe](https://avatars.discourse-cdn.com/v4/letter/z/a87d85/32.png) [@ZiqinHe](https://discourse.julialang.org/u/ZiqinHe)
#### Post date: [November 25, 2020, 4:49pm UTC](https://discourse.julialang.org/t/keyerror-key-float64-not-found/50764/1 "2020-11-25T16:49:27Z")

</div>

I am very new and I think my Julia works well before but after I restart the computer, I get this error

 ![Screen Shot 2020-11-26 at 11.46.08 AM](https://global.discourse-cdn.com/julialang/original/3X/f/f/ff8ed0161e7f1950e1e997abea7b5aecc54cef61.png)  
how can I fix this, thank you for any help.