Hello , I am new in this framework. I need an authoring tool responsive html5 for export to scorm . Adapt seems an excellent tool however 'm serious trouble installing . can I have your help ? I can not resolve the errors .

Pedro@ASUS ~
$ cd webinar-demo

Pedro@ASUS ~/webinar-demo
$ grunt build
** Using theme adapt-contrib-vanilla
** Using menu adapt-contrib-boxMenu

Running "jsonlint:src" (jsonlint) task
>> 6 files lint free.

Running "check-json" task

Running "copy:index" (copy) task
Copied 1 file

Running "copy:courseJson" (copy) task
Copied 6 files

Running "copy:courseAssets" (copy) task
Created 4 directories, copied 27 files

Running "copy:componentsAssets" (copy) task
Copied 11 files

Running "copy:extensionsAssets" (copy) task

Running "copy:menuAssets" (copy) task

Running "copy:themeAssets" (copy) task

Running "copy:themeFonts" (copy) task

Running "copy:main" (copy) task
Created 4 directories, copied 39 files

Running "concat:less" (concat) task
File src/less/adapt.less created.

Running "less:dist" (less) task
>> NameError: variable @ie8-max-width is undefined in src/less/adapt.less on lin
e 83, column 19:
>> 82 .ie8 & {
>> 83 max-width:@ie8-max-width;
>> 84 }
Warning: Error compiling src/less/adapt.less Use --force to continue.

Aborted due to warnings.

Pedro@ASUS ~/webinar-demo
$ grunt server
** Using theme adapt-contrib-vanilla
** Using menu adapt-contrib-boxMenu

Running "concurrent:server" (concurrent) task

* Using theme adapt-contrib-vanilla
* Using menu adapt-contrib-boxMenu

Running "open:server" (open) task

Done, without errors.

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Regards and thanks!