Can’t find gem railties (>= 0.a) with executable rails (gem::gemnotfoundexception)

When you encounter an error message like “Can’t find gem railties (>= 0.a) with executable rails (Gem::GemNotFoundException)”, it usually indicates that the required gem (in this case, ‘railties’) is either missing or not installed on your system. This error often occurs when you are trying to run a program or command that relies on a specific gem version which is not available.

To resolve this issue, you can try the following steps:

1. Check if the required gem (in this case, ‘railties’) is listed in your Gemfile, which is typically located in the root directory of your Ruby project. Open the Gemfile using a text editor and make sure the gem is correctly specified. Example:

           
             # Gemfile
             source 'https://rubygems.org'
           
             gem 'railties', '>= 0.a'
           
         

   Here, the version ‘>= 0.a’ indicates that any version of ‘railties’ greater than or equal to 0.a will be acceptable. If the gem is not listed or the version is incorrect, make the necessary changes and save the Gemfile.

2. Run the command bundle install in the terminal to install or update the required gems specified in the Gemfile. This command will read the Gemfile and install the necessary gems along with their dependencies. Make sure you are in the correct directory (the same directory where the Gemfile is located) when running this command.
3. If the gem is already installed, but you still face the error, it could be a problem with the gem installation. In such cases, you can try reinstalling the gem using the command gem install railties. This will download and install the latest version of the ‘railties’ gem.
4. After successfully installing or updating the required gem, try running the program or command again to see if the error has been resolved. If the error persists, there might be another underlying issue that needs further investigation.