请问下这个是什么意思？
[17:33:16] Using gulpfile ~/SourceCode/mydir/mydir/build/jsb-default/frameworks/cocos2d-x/gulpfile.js
[17:33:16] Starting ‘gen-simulator’…
Generate simulator failed
[17:33:16] Finished ‘gen-simulator’ after 7.22 ms
Generate simulator failed
[17:33:16] ‘gen-simulator’ errored after 14 ms
[17:33:16] Error: task completion callback called too many times
at finish (/Users/springrider/SourceCode/mydir/mydir/build/jsb-default/frameworks/cocos2d-x/node_modules/gulp/node_modules/orchestrator/lib/runTask.js:15:10)
at cb (/Users/springrider/SourceCode/mydir/mydir/build/jsb-default/frameworks/cocos2d-x/node_modules/gulp/node_modules/orchestrator/lib/runTask.js:29:3)
at ChildProcess. (/Users/springrider/SourceCode/mydir/mydir/build/jsb-default/frameworks/cocos2d-x/gulpfile.js:145:9)
at emitTwo (events.js:87:13)
at ChildProcess.emit (events.js:172:7)
at maybeClose (internal/child_process.js:817:16)
at Socket. (internal/child_process.js:319:11)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at Pipe._onclose (net.js:469:12)