What does the EPERM error mean when attempting to open the `/app/package.json` file in a Docker container?

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The EPERM error when attempting to open the /app/package.json file in a Docker container means "Operation not permitted". This error occurs when the file you are trying to access does not have the proper permissions or ownership. In this case, it is possible that the container is running as a user that does not have permission to access the file, or the file itself does not have the proper permissions or ownership configured.