I do not know if you are still having this problem, I struggled with the same problem until after a couple of weeks I finally resolved it. this is a problem with x64 machines.
just go to your gemfile and search gem 'tzinfo-data'
then in the array add this :x64_mingw
It should look like this:
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]
then save, upgrade the package, and then install the package, and fortunately your rails server will start.
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