events.js:352

PS F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo> gulp minify
[22:44:18] Using gulpfile F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\gulpfile.js
[22:44:18] Starting 'minify'...
[22:44:18] Finished 'minify' after 11 ms
events.js:352
throw er; // Unhandled 'error' event
^

NodeError: Callback called multiple times
at Transform.afterTransform (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\node_modules\readable-stream\lib_stream_transform.js:82:31)
at Transform.fileInclude [as _transform] (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\lib\index.js:60:9)
at Transform._read (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\node_modules\readable-stream\lib_stream_transform.js:177:10)
at Transform._write (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\node_modules\readable-stream\lib_stream_transform.js:164:83)
at doWrite (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\node_modules\readable-stream\lib_stream_writable.js:409:139)
at writeOrBuffer (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\node_modules\readable-stream\lib_stream_writable.js:398:5)
at Transform.Writable.write (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\gulp-file-include\node_modules\readable-stream\lib_stream_writable.js:307:11)
at DestroyableTransform.ondata (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\readable-stream\lib_stream_readable.js:619:20)
at DestroyableTransform.emit (events.js:375:28)
at DestroyableTransform.emit (domain.js:532:15)
Emitted 'error' event on Domain instance at:
at Transform.emit (domain.js:520:12)
at Transform.onerror (F:\传智黑马39期教学\001学习过程记录\Node\gulp_demo\node_modules\readable-stream\lib_stream_readable.js:640:52)
at Transform.emit (events.js:375:28)
at Transform.emit (domain.js:470:12)

错误原因：端口号被占用。
解决方法：修改端口号，或者干掉端口号，重新启动项目
干掉端口号方法：
1.进入cmd命令窗口，写netstat -ano|findstr "8080"

2.taskkill -PID 13512 -F