File getting uploaded succesfully but getting error in output Task Runner Window

[AvniBhatt]

File is getting uploaded successfully but getting error in Output Task runner window.
Error:

[16:06:17] Using gulpfile ~\documents\visual studio 2013\Projects\GulpTask\gulpfile.js
[16:06:17] Starting 'concat-js'...
[16:06:17] Finished 'concat-js' after 8.81 ms
[16:06:17] Starting 'minify-js'...
[16:06:17] Finished 'minify-js' after 5.21 ms
[16:06:17] Starting 'upload-to-sp'...
[16:06:17] Finished 'upload-to-sp' after 3.29 ms
[16:06:20] spsave: GulpDemo.js checked out.
[16:06:20] spsave: GulpDemo.js successfully uploaded to '<>/TestDocLib' and checked in. Checkin type: minor
[16:06:20] spsave: Error occured:
[16:06:20] spsave: Error: Argument error, options.body.

[16:06:20] spsave: Stack trace:

[16:06:20] spsave: RequestError: Error: Argument error, options.body.
    at new RequestError (<PATH>\node_modules\gulp-spsave\node_modules\spsave\node_modules\sp-request\node_modules\request-promise\lib\errors.js:14:15)
    at Request.RP$callback [as _callback] (<PATH>\node_modules\gulp-spsave\node_modules\spsave\node_modules\sp-request\node_modules\request-promise\lib\rp.js:60:25)
    at self.callback (<PATH>\node_modules\gulp-spsave\node_modules\spsave\node_modules\sp-request\node_modules\request\request.js:200:22)
    at emitOne (events.js:77:13)
    at Request.emit (events.js:169:7)
    at setContentLength (<PATH>\node_modules\gulp-spsave\node_modules\spsave\node_modules\sp-request\node_modules\request\request.js:452:14)
    at Request.init (<PATH>\node_modules\gulp-spsave\node_modules\spsave\node_modules\sp-request\node_modules\request\request.js:457:5)
    at Request.RP$initInterceptor [as init] (<PATH>\node_modules\gulp-spsave\node_modules\spsave\node_modules\sp-request\node_modules\request-promise\lib\rp.js:137:25)

Code:

gulp.task('upload-to-sp', ['minify-js'], function () {
    gulp.src("./Output/*.js")
      .pipe(spsave({
          username: "<UNAME>",
          password: "<PASSWORD>",
          siteUrl: "<URL>",
          folder: "<FOLDER>",
          checkin: true
      }));
});

Note:
This issue happens randomly. And occurs during successive builds. For first build, it uploads successfully. During successive builds, it randomly generates this error and file remains checked-out upon process termination.

If I delete the file again and re-build, it successfully uploads.

[s-KaiNet]

Can you please post full gulpfile.js?
Also check your folder, may be some special symbols are gets copied? For example from log it seems file uploaded to '<>/TestDocLib' - that's strange name for folder.

[s-KaiNet]

I was able to reproduce your issue. I will take a look today.

[s-KaiNet]

@AvniBhatt so I found the cause.
This error is thrown when your file is empty. Check if your minify-js task produces something.
Later in the evening I will add additional checking to skip empty file uploads.

[s-KaiNet]

This issue was moved to s-KaiNet/spsave#14