```ruby
# frozen_string_literal: true

#
# This code is based on https://github.com/fohte/rubocop-daemon.
#
# Copyright (c) 2018 Hayato Kawai
#
# The MIT License (MIT)
#
# https://github.com/fohte/rubocop-daemon/blob/master/LICENSE.txt
#
module RuboCop
  module Server
    module ClientCommand
      # This class is a client command to execute server process.
      # @api private
      class Exec < Base
        def run
          ensure_server!
          Cache.status_path.delete if Cache.status_path.file?
          send_request(
            command: 'exec',
            args: ARGV.dup,
            body: $stdin.tty? ? '' : $stdin.read
          )
          status
        end

        private

        def status
          unless Cache.status_path.file?
            raise "rubocop server: Could not find status file at: #{Cache.status_path}"
          end

          status = Cache.status_path.read
          raise "rubocop server: '#{status}' is not a valid status!" if (status =~ /^\d+$/).nil?

          status.to_i
        end
      end
    end
  end
end
```

Tweak exception message for RuboCop server
user
```ruby
# frozen_string_literal: true

#
# This code is based on https://github.com/fohte/rubocop-daemon.
#
# Copyright (c) 2018 Hayato Kawai
#
# The MIT License (MIT)
#
# https://github.com/fohte/rubocop-daemon/blob/master/LICENSE.txt
#
module RuboCop
  module Server
    module ClientCommand
      # This class is a client command to execute server process.
      # @api private
      class Exec < Base
        def run
          ensure_server!
          Cache.status_path.delete if Cache.status_path.file?
          send_request(
            command: 'exec',
            args: ARGV.dup,
            body: $stdin.tty? ? '' : $stdin.read
          )
          status
        end

        private

        def status
          unless Cache.status_path.file?
            raise "RuboCop server: Could not find status file at: #{Cache.status_path}"
          end

          status = Cache.status_path.read
          raise "RuboCop server: '#{status}' is not a valid status!" if (status =~ /^\d+$/).nil?

          status.to_i
        end
      end
    end
  end
end
```
assistant