# Pkg.instantiate() error
**URL:** https://discourse.julialang.org/t/pkg-instantiate-error/24386
**Category:** General Usage
**Created:** [May 19, 2019, 8:07pm UTC](https://discourse.julialang.org/t/pkg-instantiate-error/24386 "2019-05-19T20:07:59Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@juliauser](https://discourse.julialang.org/u/juliauser)
#### Post date: [May 19, 2019, 8:08pm UTC](https://discourse.julialang.org/t/pkg-instantiate-error/24386/1 "2019-05-19T20:08:00Z")
Hi,
When I start Julia and load packages - e.g. I type using Calculus - I get an error that says it cannot find the package and that I need to use Pkg.instantiate(). After I do that, the package loads. It is annoying as Pkg.instantiate() needs to be run before loading each package.
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### Author:  [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [May 20, 2019, 6:25am UTC](https://discourse.julialang.org/t/pkg-instantiate-error/24386/2 "2019-05-20T06:25:06Z")
What does
```julia
pkg> st Calculus
```
print? (you can get the `pkg>` prompt with `]`).
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### Author:  [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)
#### Post date: [May 20, 2019, 6:33am UTC](https://discourse.julialang.org/t/pkg-instantiate-error/24386/3 "2019-05-20T06:33:12Z")
This means that the files of the package has been deleted so we only have a “reference” to it from the Project / Manifest file. In order to actually use the package it needs to be downloaded.
Unless you are deleting the folder where packages gets installed `.julia/packages` I’m not sure why this would happen.