title: Permission denied starting Cordapp via systemctl
body: <p>Starting the example cordapp on Ubuntu as a service per: <a href="https://docs.corda.net/releases/release-V3.1/deploying-a-node.html" rel="nofollow noreferrer">https://docs.corda.net/releases/release-V3.1/deploying-a-node.html</a></p>
  
  <p>On running the node I get the following error:</p>
  
  <pre><code>Apr 25 17:48:04 single-node-marketplace-master systemd[1]: Started Cordapp Example - party B.
  Apr 25 17:48:22 single-node-marketplace-master java[99477]: Exception in thread "main" java.io.IOException: Permission denied
  Apr 25 17:48:22 single-node-marketplace-master java[99477]:         at java.io.UnixFileSystem.createFileExclusively(Native Method)
  Apr 25 17:48:22 single-node-marketplace-master java[99477]:         at java.io.File.createNewFile(File.java:1012)
  Apr 25 17:48:22 single-node-marketplace-master java[99477]:         at net.corda.node.internal.NodeStartup.enforceSingleNodeIsRunning(NodeStartup.kt:226)
  Apr 25 17:48:22 single-node-marketplace-master java[99477]:         at net.corda.node.internal.NodeStartup.run(NodeStartup.kt:53)
  Apr 25 17:48:22 single-node-marketplace-master java[99477]:         at net.corda.node.Corda.main(Corda.kt:13)
  </code></pre>