gulp build
[09:17:08] Using gulpfile E:\My Lessons\gulpfile.js
[09:17:08] Starting 'build'...
[09:17:08] 'build' errored after 3.23 ms
[09:17:08] TypeError: gulp.hasTask is not a function
at E:\My Lessons\node_modules\run-sequence\index.js:23:22
at Array.forEach (<anonymous>)
at verifyTaskSets (E:\My Lessons\node_modules\run-sequence\index.js:17:11)
at runSequence (E:\My Lessons\node_modules\run-sequence\index.js:130:2)
at E:\My Lessons\gulpfile.js:98:3
at build (E:\My Lessons\node_modules\undertaker\lib\set-task.js:13:15)
at bound (domain.js:426:14)
at runBound (domain.js:439:12)
at asyncRunner (E:\My Lessons\node_modules\async-done\index.js:55:18)
at processTicksAndRejections (internal/process/task_queues.js:79:11)