demo application fails at startup

Just completed install of the demo. When I attempt to run I get the following error.

[2] Server running at http://localhost:7070 [2] (node:17736) UnhandledPromiseRejectionWarning: Error: Exited with code 3 [2] at ChildProcess.cp.once.code (/home/nb6499/projects/XEDITOR/xeditor-demo/package/node_modules/opn/index.js:84:13) [2] at Object.onceWrapper (events.js:317:30) [2] at emitTwo (events.js:126:13) [2] at ChildProcess.emit (events.js:214:7) [2] at maybeClose (internal/child_process.js:915:16) [2] at Socket.stream.socket.on (internal/child_process.js:336:11) [2] at emitOne (events.js:116:13) [2] at Socket.emit (events.js:211:7) [2] at Pipe._handle.close [as _onclose] (net.js:561:12) [2] (node:17736) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) [2] (node:17736) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Version of node:
/Node.js/node-v8.12.0-linux-x64/bin/node --version v8.12.0

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