# Cannot install Revise due to CUDA unknown version?

**URL:** <https://discourse.julialang.org/t/cannot-install-revise-due-to-cuda-unknown-version/66923>\
**Category:** General Usage\
**Created:** [August 24, 2021, 4:43pm UTC](https://discourse.julialang.org/t/cannot-install-revise-due-to-cuda-unknown-version/66923 "2021-08-24T16:43:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DiracFermion1](https://avatars.discourse-cdn.com/v4/letter/d/2acd7d/32.png) [@DiracFermion1](https://discourse.julialang.org/u/DiracFermion1)\
**Post date:** [August 24, 2021, 4:43pm UTC](https://discourse.julialang.org/t/cannot-install-revise-due-to-cuda-unknown-version/66923/1 "2021-08-24T16:43:18Z")

</div>

Hi, I am trying to install Revise package for module reloading, but when I run: `import Pkg; Pkg.add("Revise")`, it gives following error:

```julia
 Resolving package versions...
Unsatisfiable requirements detected for package CUDA [052768ef]:
 CUDA [052768ef] log:
 ├─CUDA [052768ef] has no known versions!
 └─restricted to versions * by an explicit requirement — no versions left

```

Does anyone know how to fix this? Thanks!