Visual SDK - Gulp Error - task_modifyPtcsMoment

In the official tutorial the steps are 4:

1. Open a command prompt, then change the current directory to the location on your system where you extracted the SDK utility:

   cd twx-wc-sdk-utility

2. Run the following command to install the utility:

   npm link

3. Change your directory to the simple-el-widget/ folder that you created earlier (previously downloaded and unzipped😞

   cd simple-el-widget

4. In the widget folder, run the following command to create the extension:

   mub

    

    

   and i've the error : 

   exec error: Error: Command failed: gulp --e --wd D:\WORK_THINGWORX\simple-el-widget
   [11:46:40] 'task_modifyPtcsMoment' errored after 2 ms
   [11:46:40] Error: ENOENT: no such file or directory, rename 'D:\WORK_THINGWORX\simple-el-widget\tmp\build\wc\ptcs-moment\moment-import.js' -> 'D:\WORK_THINGWORX\simple-el-widget\tmp\build\wc\ptcs-moment\moment-import.js.sdk'
   [11:46:40] 'default' errored after 6.84 s

    

   could you help me ?