Running gatsby build gives the following error:

error Building static HTML failed
  15 |  * True if the custom elements polyfill is in use.
  16 |  */
> 17 | export const isCEPolyfill = window.customElements !== undefined &&
     |        ^
  18 |     window.customElements.polyfillWrapFlushCallback !==
  19 |         undefined;
  20 | /**


  WebpackError: ReferenceError: windo

export by "Clickable Prototype HTML template" , but actually nothing in the result HTML pages is clickable. Check the source code of the page, each page in Pencil was exported as an image, apparently it is un-clickable for any widgets in the page.

• Operating system: macOS Catalina 10.15.3
• Pencil version: 3.1.0