# Src\\cpu\_info.jl

**URL:** <https://discourse.julialang.org/t/src-cpu-info-jl/40516>\
**Category:** New to Julia\
**Tags:** package\
**Created:** [May 31, 2020, 7:26pm UTC](https://discourse.julialang.org/t/src-cpu-info-jl/40516 "2020-05-31T19:26:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jorge\_Silva](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jorge_silva/32/14976_2.png) [@Jorge\_Silva](https://discourse.julialang.org/u/Jorge_Silva)\
**Post date:** [May 31, 2020, 7:26pm UTC](https://discourse.julialang.org/t/src-cpu-info-jl/40516/1 "2020-05-31T19:26:45Z")

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I was using v1.3.1.  
Then I upgrade for v1.4.2 and reinstalled some packages. Now, I have both versions.  
However, in v1.4.2 I cannot use some packages. E.g., when I type “using DifferentialEquations” I got the error

"could not open file “.julia\packages\VectorizationBase\FsdEK\src\cpu\_info.jl”

What is the problem?

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**Author:** ![greg\_plowman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/greg_plowman/32/8100_2.png) [@greg\_plowman](https://discourse.julialang.org/u/greg_plowman)\
**Post date:** [May 31, 2020, 9:58pm UTC](https://discourse.julialang.org/t/src-cpu-info-jl/40516/2 "2020-05-31T21:58:52Z")

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Have you tried rebuilding the packages?

`Pkg.build()`

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**Author:** ![Elrod](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/elrod/32/22461_2.png) [@Elrod](https://discourse.julialang.org/u/Elrod)\
**Post date:** [May 31, 2020, 11:40pm UTC](https://discourse.julialang.org/t/src-cpu-info-jl/40516/3 "2020-05-31T23:40:09Z")

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`src/cpu_info.jl` is created when VectorizationBase is built.

EDIT:  
VectorizationBase will now [print a helpful error message](https://github.com/chriselrod/VectorizationBase.jl/commit/2cdbe395035bde954654e27ad2995f5f9609ac54), telling you to run `using Pkg; Pkg.build()` if the file is absent.