# Successfully added the packages but can not use the packages

**URL:** <https://discourse.julialang.org/t/successfully-added-the-packages-but-can-not-use-the-packages/79032>\
**Category:** New to Julia\
**Tags:** question\
**Created:** [April 5, 2022, 4:33am UTC](https://discourse.julialang.org/t/successfully-added-the-packages-but-can-not-use-the-packages/79032 "2022-04-05T04:33:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![yujie\_zhao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yujie_zhao/32/35206_2.png) [@yujie\_zhao](https://discourse.julialang.org/u/yujie_zhao)\
**Post date:** [April 5, 2022, 4:33am UTC](https://discourse.julialang.org/t/successfully-added-the-packages-but-can-not-use-the-packages/79032/1 "2022-04-05T04:33:37Z")

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Hi all !  
my question is like the following.  
I added the packages but can not use it.

 ![Screen Shot 2022-04-05 at 12.28.47 PM](https://global.discourse-cdn.com/julialang/original/3X/7/a/7ae3c57849da911de0f98be610f2da1e043de673.png)

thank you!

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**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [April 5, 2022, 4:37am UTC](https://discourse.julialang.org/t/successfully-added-the-packages-but-can-not-use-the-packages/79032/2 "2022-04-05T04:37:09Z")

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you are missing `using Primes`

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**Author:** ![yujie\_zhao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yujie_zhao/32/35206_2.png) [@yujie\_zhao](https://discourse.julialang.org/u/yujie_zhao)\
**Post date:** [April 5, 2022, 6:08am UTC](https://discourse.julialang.org/t/successfully-added-the-packages-but-can-not-use-the-packages/79032/3 "2022-04-05T06:08:41Z")

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oh right! thank you so much