Error: no writecb in Transform class

[Rudloff]

I get this error when running gulp-less with node 0.10 (the version packaged in Debian stable):

Potentially unhandled rejection [2] Error: no writecb in Transform class
    at afterTransform (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:75:33)
    at TransformState.afterTransform (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:59:12)
    at /home/pierre/www/KNACSS/node_modules/gulp-less/index.js:58:14
    at tryCatchReject (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/accord/node_modules/when/lib/makePromise.js:845:30)
    at runContinuation1 (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/accord/node_modules/when/lib/makePromise.js:804:4)
    at Rejected.when (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/accord/node_modules/when/lib/makePromise.js:625:4)
    at Pending.run (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/accord/node_modules/when/lib/makePromise.js:483:13)
    at Scheduler._drain (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/accord/node_modules/when/lib/Scheduler.js:62:19)
    at Scheduler.drain (/home/pierre/www/KNACSS/node_modules/gulp-less/node_modules/accord/node_modules/when/lib/Scheduler.js:27:9)
    at process._tickCallback (node.js:419:13)

[yocontra]

Can you use the latest version of node and run npm update?

[Rudloff]

I confirm it works correctly if I install node 0.12 from NodeSource, but I would prefer to stick with the version packaged in the stable repositories.

[yocontra]

@Rudloff Node 4.0 is the latest stable (and LTS) release - 0.10 is over a year old and no longer considered stable

[sakshigandhi]

I am facing the same issue, and I cannot upgrade from v0.10 to v0.12

[ArjanKw]

Received the same error with Node v0.12.33 trying to compile less to css. Updated to latest version node/npm to no avail. Cleaned cache (npm cache clean -f). Did npm update as suggested. Restarted application.

$ node -v
v4.2.4
$ npm -v
3.5.2

$ npm list --local-cache-only
-> gulp@3.9.0
-> gulp-util@3.0.7
-> gulp-less@3.0.5

[23:33:57] Using gulpfile c:\wamp\www\gulpfile.js
[23:33:57] Starting 'default'...
[23:33:57] Finished 'default' after 13 ms
[23:34:01] Starting 'less'...
[23:34:01] Finished 'less' after 8.87 ms
Potentially unhandled rejection [2] Error: no writecb in Transform class
at afterTransform (c:\wamp\www\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib_stream_transform.js:75:33)
at TransformState.afterTransform (c:\wamp\www\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib_stream_transform.js:59:12)
at c:\wamp\www\node_modules\gulp-less\index.js:58:14
at tryCatchReject (c:\wamp\www\node_modules\gulp-less\node_modules\accord\node_modules\when\lib\makePromise.js:845:30)
at runContinuation1 (c:\wamp\www\node_modules\gulp-less\node_modules\accord\node_modules\when\lib\makePromise.js:804:4)
at Rejected.when (c:\wamp\www\node_modules\gulp-less\node_modules\accord\node_modules\when\lib\makePromise.js:625:4)
at Pending.run (c:\wamp\www\node_modules\gulp-less\node_modules\accord\node_modules\when\lib\makePromise.js:483:13)
at Scheduler._drain (c:\wamp\www\node_modules\gulp-less\node_modules\accord\node_modules\when\lib\Scheduler.js:62:19)
at Scheduler.drain (c:\wamp\www\node_modules\gulp-less\node_modules\accord\node_modules\when\lib\Scheduler.js:27:9)
at doNTCallback0 (node.js:419:9)

[ArjanKw]

Tried the same today and it worked, have no clue what has changed.

[sam2x]

Got the same error, tried all advices (cleaning cache, updating), and it's not working, still got this error :

 Potentially unhandled rejection [2] Error: no writecb in Transform class

My versions :

 $ node -v
 v5.4.1
 $ npm -v
 3.3.12
 $ gulp -v
 [16:14:22] CLI version 3.9.0
 [16:14:22] Local version 3.9.1

gulp-less@3.0.5

Please help, would listen any comments (it's an urgent task, since it breaks my whole dev process....)

[sam2x]

Tried with all versions of gulp-less > 3.0.0 and the master version. Not working.

[sam2x]

Downgrading gulp-less to "^1.3.2" worked -_-

[Saturate]

Maybe this node engines should be changed in the package.json to reflect what version is working/needed?

https://github.com/plus3network/gulp-less/blob/master/package.json#L13-L15
https://docs.npmjs.com/files/package.json#engines

[licx]

Any news on this issue?
I'm experiencing it with node 4.4.5

[wesleypimentel]

I solved my problem with "no writecb in Transform class" in this way:

I searched file by file for possible syntax errors or something.
I noticed that was related with a imported file with some mixins and animations.
Then checked the animation keyframes:

@Keyframes "foo" { ... ("with quotes")

I decided remove the quotes, like this:

@Keyframes foo { ... (without quotes)

After this adjustment in all keyframes, the gulp-less run perfectly, no errors on task.

[stephenlacy]

@wesleypimentel does wrapping the plugin with gulpplumber assist in showing the error?

Since the original issue is about a year old I'll elect to close it.