title: Keystore file exists but is empty?
body: <p>I need the SHA 1 fingerprint from my RELEASE key and as I understand the key is generated when I select the option in Android Studio to build a signed release APK and then I get a Keystore.jks file.By following the <a href="https://developers.google.com/android/guides/client-auth" rel="noreferrer">google documentation</a> I did this command <code>keytool -exportcert -list -v \
  -alias &lt;your-key-name&gt; -keystore &lt;path-to-production-keystore&gt;</code>, but this gave me 
  <code>illegal options:/</code> error so I looked around the net and did this <code>keytool -exportcert -alias freenthrowkey -keystore C:\Users\User\Documents\FreeNthrowkey</code></p>
  
  <p>and this now gives me this error: <code>keytool error: java.lang.Exception: Keystore file exists, but is empty: C:\Users\User\Documents\FreeNthrowkey</code></p>
  
  <p>Please if anyone could help me out I would REALLY appreciate it.</p>