Visual SDK - Gulp Error

Hi, I'm trying to build a widget using the Visual SDK on Thingworx 9.

I've already downloaded the required packages from the PTC Software Download page:

• MED-61347-CD-090_F000_WEB-Component-SDK-Utility.zip
• ThingWorx_Web_Component_Widget.zip

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
   

An extension ZIP file is created and placed in the dist/ folder of your working directory. You are now ready to import the extension.

But the mub command gives me back this error:

Starting series of gulp tasks for the wrapping...

exec error: Error: Command failed: gulp --e --wd C:\CDM\GitLab Cloud\libraries\thingworx\thingworx-web-component-library\simple-el-widget
[10:12:30] Task never defined: Cloud\libraries\thingworx\thingworx-web-component-library\simple-el-widget
[10:12:30] To list available tasks, try running: gulp --tasks

Seems that in the widget folder the gold task file is missing.
There is anyone who already faced this error?

thanks,

Alessandro