Watch task fail

[qiu8310]

When run gulp watch, and then update any source file will get this error:

[21:12:41] Plumber found unhandled error:
 RangeError in plugin 'gulp-mocha'
Message:
    Maximum call stack size exceeded
Stack:
    at handleException (/Users/mora/Workspace/xxyyiu/node_modules/gulp-mocha/index.js:38:26)
    at /Users/mora/Workspace/xxyyiu/node_modules/gulp-mocha/index.js:62:5
    at b (domain.js:183:18)
    at Domain.run (domain.js:123:23)
    at Stream.<anonymous> (/Users/mora/Workspace/xxyyiu/node_modules/gulp-mocha/index.js:43:5)
    at _end (/Users/mora/Workspace/xxyyiu/node_modules/gulp-mocha/node_modules/through/index.js:65:9)
    at Stream.stream.end (/Users/mora/Workspace/xxyyiu/node_modules/gulp-mocha/node_modules/through/index.js:74:5)
    at DestroyableTransform.onend (/Users/mora/Workspace/xxyyiu/node_modules/gulp-plumber/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:523:10)
    at DestroyableTransform.g (events.js:180:16)
    at DestroyableTransform.EventEmitter.emit (events.js:117:20)