Returning Error with No Details

[mudetroit]

I am getting an error out of gulp-less, but as you can see I am not receiving any details from it, making it difficult for me to pinpoint what the issue is..

[11:57:04] Starting 'styles'...
[11:57:06] Plumber found unhandled error:
 Error in plugin 'gulp-less'
Message:
    First argument needs to be a number, array or string. in file undefined line no. undefined
Details:
    lineNumber: undefined
    fileName: undefined
[11:57:07] Finished 'styles' after 3.02 s
[11:57:07] Starting 'watch'...
[11:57:07] Finished 'watch' after 155 ms
[11:57:07] Starting 'clientBuild'...
[11:57:07] Finished 'clientBuild' after 5.1 μs

Here is the styles task that runs gul less, it is coffeescript, but should be legible.

gulp = require 'gulp'
{less, sourcemaps, plumber} = require('gulp-load-plugins')()

gulp.task 'styles', ->
    gulp.src(['./public/include/less/**/*.less', '!./**/_*.less'])
    .pipe plumber()
    .pipe sourcemaps.init()
    .pipe less({verbose: true})
    .pipe sourcemaps.write()
    .pipe gulp.dest('./public/include/css')

When I remove sourcemaps from the equation the error goes away. I am not certain if it is being generated by gulp-less or gulp-sourcemaps, but something in the interaction of the two is causing an odd error. I will cross post this on gulp-sourcemaps as well.

gulp-sourcemaps/gulp-sourcemaps#78

[stephenlacy]

Please create a test repo to reproduce this bug

[yocontra]

Hmm weird... it's possible that those attributes on the error coming out of less have some magic logic on them, maybe they are getters pointing to the sourcemap which gulp-sourcemap is modifying.

[luin]

same issue here

[aliai]

I ran into the same problem. I started debugging and found out that the bug resides in less module (specifically when it tries to create a base64 format for an undefined input).

In my case, I have a variables.less file that always ends up as an empty variables.css file that could not be handled by the sourcemap. So I just exclude it from the stream and everything went alright. I see you are excluding _*.less files but maybe you have another empty file somewhere.

[HaNdTriX]

#122

[OJezu]

Related (I hope): less/less.js#2430
EDIT: duh, it autolinked above. Oh, well.

[yocontra]

fixed in 2.0.3