[11:34:43] Using gulpfile ~/github/ultimate-graphframework-comparison/gulpfile.js
[11:34:43] Starting 'default'...
[11:34:43] Starting 'build-data'...
[11:34:43] Starting 'versioninfo'...
events.js:160
throw er; // Unhandled 'error' event
^
Error: Command failed: sed -i "s/§§date§§/2017-07-21/" ./app/VersionInformation.ts
sed: 1: "./app/VersionInformatio ...": invalid command code .
at ChildProcess.exithandler (child_process.js:204:12)
at emitTwo (events.js:106:13)
at ChildProcess.emit (events.js:191:7)
at maybeClose (internal/child_process.js:886:16)
at Socket.<anonymous> (internal/child_process.js:342:11)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at Pipe._handle.close [as _onclose] (net.js:501:12)