title: ERROR: While executing gem ... (Zlib::GzipFile::Error) not in gzip format
body: <p>I am trying to execute the command "gem update --system" in my windows command prompt and it shows the error as </p>
  
  <pre><code>Updating rubygems-update
  ERROR:  While executing gem ... (Zlib::GzipFile::Error)
      not in gzip format
  </code></pre>
  
  <p>When I try to install any gems also with gem install gemname command it is showing the same error message.</p>
  
  <p>Please help. I am executing the command in windows.</p>