Cannot install Revise due to CUDA unknown version?

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

 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!